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865天前<?php |
session_start(); //MUST START SESSION |
$string_length = 4; //NUMBER OF CHARS TO DISPLAY |
$large_letters = array('m','w'); |
$rand_string = ''; |
|
for ($i=0; $i<$string_length; $i++) { |
//PICK A RANDOM LOWERCASE LETTER USING ASCII CODE |
$rand_string .= chr(rand(97,122)); |
} |
|
//IMAGE VARIABLES |
//$width = 100; |
//$height = 36; |
$width = 60; |
$height = 25; |
|
//INIT IMAGE |
$img = imagecreatetruecolor($width, $height); |
|
//ALLOCATE COLORS |
$black = imagecolorallocate($img, 0, 0, 0); |
$gray = imagecolorallocate($img, 110, 110, 110); |
$medgray = imagecolorallocate($img, 180, 180, 180); |
$lightgray = imagecolorallocate($img, 220, 220, 220); |
//FILL BACKGROUND |
imagefilledrectangle($img, 0, 0, $width, $height, $lightgray); |
|
//ADD NOISE - DRAW background squares |
$square_count = 6; |
for ($i = 0; $i < 10; $i++) { |
$cx = (int)rand(0, $width/2); |
$cy = (int)rand(0, $height); |
$h = $cy + (int)rand(0, $height/5); |
$w = $cx + (int)rand($width/3, $width); |
imagefilledrectangle($img, $cx, $cy, $w, $h, $medgray); |
} |
|
//ADD NOISE - DRAW ELLIPSES |
$ellipse_count = 5; |
for ($i = 0; $i < $ellipse_count; $i++) { |
$cx = (int)rand(-1*($width/2), $width + ($width/2)); |
$cy = (int)rand(-1*($height/2), $height + ($height/2)); |
$h = (int)rand($height/2, 2*$height); |
$w = (int)rand($width/2, 2*$width); |
imageellipse($img, $cx, $cy, $w, $h, $gray); |
} |
|
//REPLACE THIS WITH THE FONT YOU UPLOAD |
$font = '../tiff/DejaVuSerifCondensed-Italic.ttf'; |
//$font = 'monofont.ttf'; |
$font_size = 16; |
|
//CALC APPROX LOCATION - CUSTOMIZED FOR ABOVE FONT |
$y_value = ($height/2) + ($font_size/2); |
$x_value = 0; |
|
//DRAW STRING USING TRUE TYPE FUNCTION |
|
for ($i = 0; $i < $string_length; $i++) { |
$chr = substr($rand_string, $i, 1); |
$x_value += 3 * ($font_size/5); |
imagettftext($img, $font_size, 0, $x_value, $y_value, $black, $font, $chr); |
//check to see if larger than normal letters, if so add more horiz space |
if (in_array($chr, $large_letters)) { |
$x_value += 4; |
} |
} |
|
$auth_type = isset($_REQUEST['type'])?$_REQUEST['type']:''; |
if($auth_type=="login") |
{ |
$_SESSION['authcode_login']=$rand_string; |
} |
else |
{ |
//$_SESSION['encoded_captcha'] = md5($rand_string . 'my_secret_key'); |
$_SESSION['authcode']=$rand_string; |
} |
|
//OUTPUT IMAGE HEADER AND SEND TO BROWSER |
header("Content-Type: image/png"); |
imagepng($img); |
?> |
