php封装的mongodb操作类 curd 增删改查

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<?php  

/* 
 * To change this template, choose Tools | Templates 
 * and open the template in the editor. 
 */  

class mongo_db {  

    private $config;  
    private $connection;  
    private $db;  
    private $connection_string;  
    private $host;  
    private $port;  
    private $user;  
    private $pass;  
    private $dbname;  
    private $persist;  
    private $persist_key;  
    private $selects = array();  
    private $wheres = array();  
    private $sorts = array();  
    private $limit = 999999;  
    private $offset = 0;  
    private $timeout = 200;  
    private $key = 0;  
    /**     *   --------------------------------------------------------------------------------     *  CONSTRUCTOR  *  --------------------------------------------------------------------------------     *   *  Automatically check if the Mongo PECL extension has been installed/enabled.  *  Generate the connection string and establish a connection to the MongoDB.    */  

    public function __construct() {  
        if((IS_NOSQL != 1)){  
            return;  
        }  
        if (!class_exists('Mongo')) {  
            //$this->error("The MongoDB PECL extension has not been installed or enabled", 500);  
        }  
        $configs =wxcity_base::load_config("cache","mongo_db");  
        $num = count($configs['connect']);  
        $this->timeout = trim($configs['timeout']);  
        $keys = wxcity_base::load_config('double');  
        $this->key = $keys['mongo_db'];  
        $this->config = $configs['connect'][$this->key];  
        $status = $this->connect();  
        if($status == false)  
        {  
            for($i = 1; $i < $num; $i++)  
            {  
                $n = $this->key + $i;  
                $key = $n >= $num ? $n - $num : $n;  
                $this->config = $configs['connect'][$key];   
                $status = $this->connect();  
                if($status!=false)  
                {  
                    $keys['mongo_db'] = $key ;  
                    $this->key = $key;  
                    $data = "<?php\nreturn ".var_export($keys, true).";\n?>";  
                    file_put_contents(WHTY_PATH.'configs/double.php', $data, LOCK_EX);  
                    break;  
                }  
            }  
        }  
        if($status==false)  
        {  
            die('mongoDB not connect');  
        }  
    }  

    function __destruct() {  
        if((IS_NOSQL != 1)){  
            return;  
        }  
        if($this->connection)  
        {  
            $this->connection->close();  
        }  
    }  

        /**     *   --------------------------------------------------------------------------------     *  CONNECT TO MONGODB   *  --------------------------------------------------------------------------------     *   *  Establish a connection to MongoDB using the connection string generated in   *  the connection_string() method.  If 'mongo_persist_key' was set to true in the   *  config file, establish a persistent connection.  We allow for only the 'persist'     *  option to be set because we want to establish a connection immediately.  */  
    private function connect() {  
        $this->connection_string();  
        $options = array('connect'=>true,'timeout'=>$this->timeout);  
        try {  
            $this->connection = new Mongo($this->connection_string, $options);  
            $this->db = $this->connection->{$this->dbname};  
            return($this);  
        } catch (MongoConnectionException $e) {  
            return false;  
        }  

    }  
    /**     *   --------------------------------------------------------------------------------     *  BUILD CONNECTION STRING  *  --------------------------------------------------------------------------------     *   *  Build the connection string from the config file.    */  
    private function connection_string() {  
        $this->host = trim($this->config['hostname']);  
        $this->port = trim($this->config['port']);  
        $this->user = trim($this->config['username']);  
        $this->pass = trim($this->config['password']);  
        $this->dbname = trim($this->config['database']);  
        $this->persist = trim($this->config['autoconnect']);  
        $this->persist_key = trim($this->config['mongo_persist_key']);  

        $connection_string = "mongodb://";  
        if (emptyempty($this->host)) {  
            $this->error("The Host must be set to connect to MongoDB", 500);  
        } if (emptyempty($this->dbname)) {  
            $this->error("The Database must be set to connect to MongoDB", 500);  
        } if (!emptyempty($this->user) && !emptyempty($this->pass)) {  
            $connection_string .= "{$this->user}:{$this->pass}@";  
        } if (isset($this->port) && !emptyempty($this->port)) {  
            $connection_string .= "{$this->host}:{$this->port}";  
        } else {  
            $connection_string .= "{$this->host}";  
        } $this->connection_string = trim($connection_string);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  Switch_db    *  --------------------------------------------------------------------------------     *   *  Switch from default database to a different db   */  
    public function switch_db($database = '') {  
        if (emptyempty($database)) {  
            $this->error("To switch MongoDB databases, a new database name must be specified", 500);  
        } $this->dbname = $database;  
        try {  
            $this->db = $this->connection->{$this->dbname};  
            return(TRUE);  
        } catch (Exception $e) {  
            $this->error("Unable to switch Mongo Databases: {$e->getMessage()}", 500);  
        }  
    }  

    /**     *   --------------------------------------------------------------------------------     *  SELECT FIELDS    *  --------------------------------------------------------------------------------     *   *  Determine which fields to include OR which to exclude during the query process.  *  Currently, including and excluding at the same time is not available, so the     *  $includes array will take precedence over the $excludes array.  If you want to   *  only choose fields to exclude, leave $includes an empty array().     *   *  @usage: $this->mongo_db->select(array('foo', 'bar'))->get('foobar');    */  
    public function select($includes = array(), $excludes = array()) {  
        if (!is_array($includes)) {  
            $includes = array();  
        }   
        if (!is_array($excludes)) {  
            $excludes = array();  
        }   
        if (!emptyempty($includes)) {  
            foreach ($includes as $col) {  
                $this->selects[$col] = 1;  
            }  
        } else {  
            foreach ($excludes as $col) {  
                $this->selects[$col] = 0;  
            }  
        } return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE PARAMETERS     *  --------------------------------------------------------------------------------     *   *  Get the documents based on these search parameters.  The $wheres array should    *  be an associative array with the field as the key and the value as the search    *  criteria.    *   *  @usage = $this->mongo_db->where(array('foo' => 'bar'))->get('foobar');   */  
    public function where($wheres = array()) {  
        foreach ((array)$wheres as $wh => $val) {  
            $this->wheres[$wh] = $val;  
        } return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE_IN PARAMETERS  *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is in a given $in array().     *   *  @usage = $this->mongo_db->where_in('foo', array('bar', 'zoo', 'blah'))->get('foobar');  */  
    public function where_in($field = "", $in = array()) {  
        $this->where_init($field);  
        $this->wheres[$field]['$in'] = $in;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE_NOT_IN PARAMETERS  *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is not in a given $in array().     *   *  @usage = $this->mongo_db->where_not_in('foo', array('bar', 'zoo', 'blah'))->get('foobar');  */  
    public function where_not_in($field = "", $in = array()) {  
        $this->where_init($field);  
        $this->wheres[$field]['$nin'] = $in;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE GREATER THAN PARAMETERS    *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is greater than $x     *   *  @usage = $this->mongo_db->where_gt('foo', 20);     */  
    public function where_gt($field = "", $x) {  
        $this->where_init($field);  
        $this->wheres[$field]['$gt'] = $x;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE GREATER THAN OR EQUAL TO PARAMETERS    *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is greater than or equal to $x     *   *  @usage = $this->mongo_db->where_gte('foo', 20);    */  
    public function where_gte($field = "", $x) {  
        $this->where_init($field);  
        $this->wheres[$field]['$gte'] = $x;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE LESS THAN PARAMETERS   *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is less than $x    *   *  @usage = $this->mongo_db->where_lt('foo', 20);     */  
    public function where_lt($field = "", $x) {  
        $this->where_init($field);  
        $this->wheres[$field]['$lt'] = $x;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE LESS THAN OR EQUAL TO PARAMETERS   *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is less than or equal to $x    *   *  @usage = $this->mongo_db->where_lte('foo', 20);    */  
    public function where_lte($field = "", $x) {  
        $this->where_init($field);  
        $this->wheres[$field]['$lte'] = $x;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE BETWEEN PARAMETERS     *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is between $x and $y   *   *  @usage = $this->mongo_db->where_between('foo', 20, 30);    */  
    public function where_between($field = "", $x, $y) {  
        $this->where_init($field);  
        $this->wheres[$field]['$gte'] = $x;  
        $this->wheres[$field]['$lte'] = $y;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE BETWEEN AND NOT EQUAL TO PARAMETERS    *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is between but not equal to $x and $y  *   *  @usage = $this->mongo_db->where_between_ne('foo', 20, 30);     */  
    public function where_between_ne($field = "", $x, $y) {  
        $this->where_init($field);  
        $this->wheres[$field]['$gt'] = $x;  
        $this->wheres[$field]['$lt'] = $y;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE NOT EQUAL TO PARAMETERS    *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is not equal to $x     *   *  @usage = $this->mongo_db->where_between('foo', 20, 30);    */  
    public function where_ne($field = "", $x) {  
        $this->where_init($field);  
        $this->wheres[$field]['$ne'] = $x;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE OR     *  --------------------------------------------------------------------------------     *   *  Get the documents where the value of a $field is in one or more values   *   *  @usage = $this->mongo_db->where_or('foo', array( 'foo', 'bar', 'blegh' );  */  
    public function where_or($field = "", $values) {  
        $this->where_init($field);  
        $this->wheres[$field]['$or'] = $values;  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE AND    *  --------------------------------------------------------------------------------     *   *  Get the documents where the elements match the specified values  *   *  @usage = $this->mongo_db->where_and( array ( 'foo' => 1, 'b' => 'someexample' );     */  
    public function where_and($elements_values = array()) {  
        foreach ((array)$elements_values as $element => $val) {  
            $this->wheres[$element] = $val;  
        } return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE MOD    *  --------------------------------------------------------------------------------     *   *  Get the documents where $field % $mod = $result  *   *  @usage = $this->mongo_db->where_mod( 'foo', 10, 1 );   */  
    public function where_mod($field, $num, $result) {  
        $this->where_init($field);  
        $this->wheres[$field]['$mod'] = array($num, $result);  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------    *   Where size  *   --------------------------------------------------------------------------------    *   *   Get the documents where the size of a field is in a given $size int *   *   @usage : $this->mongo_db->where_size('foo', 1)->get('foobar');  */  
    public function where_size($field = "", $size = "") {  
        $this->_where_init($field);  
        $this->wheres[$field]['$size'] = $size;  
        return ($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  LIKE PARAMETERS  *  --------------------------------------------------------------------------------     *       *  Get the documents where the (string) value of a $field is like a value. The defaults     *  allow for a case-insensitive search.     *   *  @param $flags    *  Allows for the typical regular expression flags:     *      i = case insensitive     *      m = multiline    *      x = can contain comments     *      l = locale   *      s = dotall, "." matches everything, including newlines   *      u = match unicode    *   *  @param $enable_start_wildcard    *  If set to anything other than TRUE, a starting line character "^" will be prepended  *  to the search value, representing only searching for a value at the start of     *  a new line.  *   *  @param $enable_end_wildcard  *  If set to anything other than TRUE, an ending line character "$" will be appended    *  to the search value, representing only searching for a value at the end of   *  a line.  *   *  @usage = $this->mongo_db->like('foo', 'bar', 'im', FALSE, TRUE);   */  
    public function like($field = "", $value = "", $flags = "i", $enable_start_wildcard = TRUE, $enable_end_wildcard = TRUE) {  
        $field = (string) trim($field);  
        $this->where_init($field);  
        $value = (string) trim($value);  
        $value = quotemeta($value);  
        if ($enable_start_wildcard !== TRUE) {  
            $value = "^" . $value;  
        } if ($enable_end_wildcard !== TRUE) {  
            $value .= "$";  
        } $regex = "/$value/$flags";  
        $this->wheres[$field] = new MongoRegex($regex);  
        return($this);  
    }  

    public function wheres($where){  
        $this->wheres = $where;  
    }  

    /**     *   --------------------------------------------------------------------------------     *  ORDER BY PARAMETERS  *  --------------------------------------------------------------------------------     *   *  Sort the documents based on the parameters passed. To set values to descending order,    *  you must pass values of either -1, FALSE, 'desc', or 'DESC', else they will be   *  set to 1 (ASC).  *   *  @usage = $this->mongo_db->where_between('foo', 20, 30);    */  
    public function order_by($fields = array()) {  
        if (!is_array($fields) || !count($fields)) return ;  
        foreach ($fields as $col => $val) {  
            if ($val == -1 || $val === FALSE || strtolower($val) == 'desc') {  
                $this->sorts[$col] = -1;  
            } else {  
                $this->sorts[$col] = 1;  
            }  
        } return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  LIMIT DOCUMENTS  *  --------------------------------------------------------------------------------     *   *  Limit the result set to $x number of documents   *   *  @usage = $this->mongo_db->limit($x);   */  
    public function limit($x = 99999) {  
        if ($x !== NULL && is_numeric($x) && $x >= 1) {  
            $this->limit = (int) $x;  
        } return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  OFFSET DOCUMENTS     *  --------------------------------------------------------------------------------     *   *  Offset the result set to skip $x number of documents     *   *  @usage = $this->mongo_db->offset($x);  */  
    public function offset($x = 0) {  
        if ($x !== NULL && is_numeric($x) && $x >= 1) {  
            $this->offset = (int) $x;  
        } return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  GET_WHERE    *  --------------------------------------------------------------------------------     *   *  Get the documents based upon the passed parameters   *   *  @usage = $this->mongo_db->get_where('foo', array('bar' => 'something'));    */  
    public function get_where($collection = "", $where = array(), $limit = 99999, $orderby=array()) {  
        if (is_array($orderby) || !emptyempty($orderby)) {  
            $order_by = $this->order_by($order_by);  
        }  
        return($this->where($where)->limit($limit)->get($collection));  
    }  
    public function selectA($collection = "", $limit = 99999, $orderby=array()) {  
        if(intval($limit)<1){  
            $limit = 999999;  
        }  
        $order_by = $this->order_by($orderby);  
        $re = $this->limit($limit)->get($collection);  
        $this->clear();  
        return (array)$re;  
    }  

    public function listinfo($collection = "", $orderby=array(), $page=1, $pagesize=12) {  
        $page = max(intval($page), 1);  
        $offset = $pagesize * ($page - 1);  
        $pagesizes = $offset + $pagesize;  
        $this->offset($offset);  
        $order_by = $this->order_by($orderby);  
        $re = $this->limit($pagesize)->get($collection);  
        $this->limit(999999);  
        $count = $this->count($collection);  
        $this->pages = pages($count, $page, $pagesize);  
        return (array)$re;  
    }  

    /**     *   --------------------------------------------------------------------------------     *  GET  *  --------------------------------------------------------------------------------     *   *  Get the documents based upon the passed parameters   *   *  @usage = $this->mongo_db->get('foo', array('bar' => 'something'));  */  
    public function get($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("In order to retreive documents from MongoDB, a collection name must be passed", 500);  
        } $results = array();  
        $documents = $this->db->{$collection}->find($this->wheres, $this->selects)->limit((int) $this->limit)->skip((int) $this->offset)->sort($this->sorts);  
        $returns = array();  
        foreach ($documents as $doc): $returns[] = $doc;  
        endforeach;  
        return($returns);  
    }  

    public function getMy($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("In order to retreive documents from MongoDB, a collection name must be passed", 500);  
        } $results = array();  
        $documents = $this->db->{$collection}->find($this->wheres, $this->selects)->limit((int) $this->limit)->skip((int) $this->offset)->sort($this->sorts);  
        $returns = array();  
        foreach ($documents as $doc): $returns[] = $doc;  
        endforeach;  
        $this -> clear();  
        return($returns);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  COUNT    *  --------------------------------------------------------------------------------     *   *  Count the documents based upon the passed parameters     *   *  @usage = $this->mongo_db->get('foo');  */  
    public function count($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("In order to retreive a count of documents from MongoDB, a collection name must be passed", 500);  
        } $count = $this->db->{$collection}->find($this->wheres)->limit((int) $this->limit)->skip((int) $this->offset)->count();  
        $this->clear();  
        return($count);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  INSERT   *  --------------------------------------------------------------------------------     *   *  Insert a new document into the passed collection     *   *  @usage = $this->mongo_db->insert('foo', $data = array());  */  
    public function insert($collection = "", $data = array(), $name='ID') {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection selected to insert into", 500);  
        } if (count($data) == 0 || !is_array($data)) {  
            $this->error("Nothing to insert into Mongo collection or insert is not an array", 500);  
        } try {  
        /** 
            wxcity_base::load_sys_class('whtysqs','',0);  
            $mongoseq_class = new whtysqs('creaseidsqs'); 
            $re = $mongoseq_class->query("?name=" . $collection . "&opt=put&data=1"); 
        **/  
            $re = put_sqs('list_mongo_creaseidsqs','1');  
            if(is_numeric($re)){  
                $re++;  
                $data[$name] = intval($re);  
            }else{  
                $data[$name] = intval(time());  
                //die('mongosqs error');  
            }  
            $this->db->{$collection}->insert($data, array('fsync' => TRUE));   
            $this->clear();  
            return $data[$name];  
        } catch (MongoCursorException $e) {  
            $this->error("Insert of data into MongoDB failed: {$e->getMessage()}", 500);  
        }  
    }  

    public function insertWithId($collection = "", $data = array()) {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection selected to insert into", 500);  
        } if (count($data) == 0 || !is_array($data)) {  
            $this->error("Nothing to insert into Mongo collection or insert is not an array", 500);  
        } try {  
            $this->db->{$collection}->insert($data, array('fsync' => TRUE));   
            $this->clear();  
            return 1;  
        } catch (MongoCursorException $e) {  
            $this->error("Insert of data into MongoDB failed: {$e->getMessage()}", 500);  
        }  
    }  
    /**     *   --------------------------------------------------------------------------------     *  UPDATE   *  --------------------------------------------------------------------------------     *   *  Update a document into the passed collection     *   *  @usage = $this->mongo_db->update('foo', $data = array());  */  
    public function update($collection = "", $data = array()) {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection selected to update", 500);  
        } if (count($data) == 0 || !is_array($data)) {  
            $this->error("Nothing to update in Mongo collection or update is not an array", 500);  
        } try {  
            $this->db->{$collection}->update($this->wheres, array('$set' => $data), array('fsync' => TRUE, 'multiple' => FALSE));  
            $this->clear();  
            return(TRUE);  
        } catch (MongoCursorException $e) {  
            $this->error("Update of data into MongoDB failed: {$e->getMessage()}", 500);  
        }  
    }  

    /**     *   --------------------------------------------------------------------------------     *  UPDATE_ALL   *  --------------------------------------------------------------------------------     *   *  Insert a new document into the passed collection     *   *  @usage = $this->mongo_db->update_all('foo', $data = array());  */  
    public function update_all($collection = "", $data = array()) {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection selected to update", 500);  
        } if (count($data) == 0 || !is_array($data)) {  
            $this->error("Nothing to update in Mongo collection or update is not an array", 500);  
        } try {  
            $this->db->{$collection}->update($this->wheres, array('$set' => $data), array('fsync' => TRUE, 'multiple' => TRUE));  
            return(TRUE);  
        } catch (MongoCursorException $e) {  
            $this->error("Update of data into MongoDB failed: {$e->getMessage()}", 500);  
        }  
    }  

    /**     *   --------------------------------------------------------------------------------     *  DELETE   *  --------------------------------------------------------------------------------     *   *  delete document from the passed collection based upon certain criteria   *   *  @usage = $this->mongo_db->delete('foo', $data = array());  */  
    public function delete($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection selected to delete from", 500);  
        } try {  
            $this->db->{$collection}->remove($this->wheres, array('fsync' => TRUE, 'justOne' => TRUE));  
            $this->clear();  
            return(TRUE);  
        } catch (MongoCursorException $e) {  
            $this->error("Delete of data into MongoDB failed: {$e->getMessage()}", 500);  
        }  
    }  

    /**     *   --------------------------------------------------------------------------------     *  DELETE_ALL   *  --------------------------------------------------------------------------------     *   *  Delete all documents from the passed collection based upon certain criteria  *   *  @usage = $this->mongo_db->delete_all('foo', $data = array());  */  
    public function delete_all($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection selected to delete from", 500);  
        } try {  
            $this->db->{$collection}->remove($this->wheres, array('fsync' => TRUE, 'justOne' => FALSE));  
            return(TRUE);  
        } catch (MongoCursorException $e) {  
            $this->error("Delete of data into MongoDB failed: {$e->getMessage()}", 500);  
        }  
    }  

    /**     *   --------------------------------------------------------------------------------     *  ADD_INDEX    *  --------------------------------------------------------------------------------     *   *  Ensure an index of the keys in a collection with optional parameters. To set values to descending order,     *  you must pass values of either -1, FALSE, 'desc', or 'DESC', else they will be   *  set to 1 (ASC).  *   *  @usage = $this->mongo_db->add_index($collection, array('first_name' => 'ASC', 'last_name' => -1), array('unique' => TRUE));   */  
    public function add_index($collection = "", $keys = array(), $options = array()) {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection specified to add index to", 500);  
        } if (emptyempty($keys) || !is_array($keys)) {  
            $this->error("Index could not be created to MongoDB Collection because no keys were specified", 500);  
        } foreach ($keys as $col => $val) {  
            if ($val == -1 || $val === FALSE || strtolower($val) == 'desc') {  
                $keys[$col] = -1;  
            } else {  
                $keys[$col] = 1;  
            }  
        } if ($this->db->{$collection}->ensureIndex($keys, $options) == TRUE) {  
            $this->clear();  
            return($this);  
        } else {  
            $this->error("An error occured when trying to add an index to MongoDB Collection", 500);  
        }  
    }  

    /**     *   --------------------------------------------------------------------------------     *  REMOVE_INDEX     *  --------------------------------------------------------------------------------     *   *  Remove an index of the keys in a collection. To set values to descending order,  *  you must pass values of either -1, FALSE, 'desc', or 'DESC', else they will be   *  set to 1 (ASC).  *   *  @usage = $this->mongo_db->remove_index($collection, array('first_name' => 'ASC', 'last_name' => -1));    */  
    public function remove_index($collection = "", $keys = array()) {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection specified to remove index from", 500);  
        } if (emptyempty($keys) || !is_array($keys)) {  
            $this->error("Index could not be removed from MongoDB Collection because no keys were specified", 500);  
        } if ($this->db->{$collection}->deleteIndex($keys, $options) == TRUE) {  
            $this->clear();  
            return($this);  
        } else {  
            $this->error("An error occured when trying to remove an index from MongoDB Collection", 500);  
        }  
    }  

    /**     *   --------------------------------------------------------------------------------     *  REMOVE_ALL_INDEXES   *  --------------------------------------------------------------------------------     *   *  Remove all indexes from a collection.    *   *  @usage = $this->mongo_db->remove_all_index($collection);   */  
    public function remove_all_indexes($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection specified to remove all indexes from", 500);  
        } $this->db->{$collection}->deleteIndexes();  
        $this->clear();  
        return($this);  
    }  

    /**     *   --------------------------------------------------------------------------------     *  LIST_INDEXES     *  --------------------------------------------------------------------------------     *   *  Lists all indexes in a collection.   *   *  @usage = $this->mongo_db->list_indexes($collection);   */  
    public function list_indexes($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection specified to remove all indexes from", 500);  
        } return($this->db->{$collection}->getIndexInfo());  
    }  

    /**     *   --------------------------------------------------------------------------------     *  DROP COLLECTION  *  --------------------------------------------------------------------------------     *   *  Removes the specified collection from the database.  Be careful because this     *  can have some very large issues in production!   */  
    public function drop_collection($collection = "") {  
        if (emptyempty($collection)) {  
            $this->error("No Mongo collection specified to drop from database", 500);  
        } $this->db->{$collection}->drop();  
        return TRUE;  
    }  

    /**     *   --------------------------------------------------------------------------------     *  CLEAR    *  --------------------------------------------------------------------------------     *   *  Resets the class variables to default settings   */  
    private function clear() {  
        $this->selects = array();  
        $this->wheres = array();  
        $this->limit = NULL;  
        $this->offset = NULL;  
        $this->sorts = array();  
    }  

    /**     *   --------------------------------------------------------------------------------     *  WHERE INITIALIZER    *  --------------------------------------------------------------------------------     *   *  Prepares parameters for insertion in $wheres array().    */  
    private function where_init($param) {  
        if (!isset($this->wheres[$param])) {  
            $this->wheres[$param] = array();  
        }  
    }  

    public function error($str, $t) {  
        echo $str;  
        exit;  
    }  

}  

?>