php BOM头检查

[php]代码库

<?php
	/**
	 *to do 用于检查BOM头
	 *@param  string $url
	 *@return boolean
	*/
	//检查BOM头
    public function checkBom($contents) {
        $charset[1] = substr($contents,0,1);
        $charset[2] = substr($contents,1,1);
        $charset[3] = substr($contents,2,1);
        if (ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191) {
            return substr($contents,3);
        }
        return $contents;
    }