转换编码到utf-8

/**

 * 转换编码，通常是转换为utf-8

 *

 * @param string $string  要转换的字符串

 * @param string $toencode 要转换为的编码,默认为UTF-8

 * @return string

 */

function convert_encoding( $string, $to_encode = 'UTF-8' ){

//当前编码

$now_encode = detect_encode( $string );

// 只有编码不同时才转换

if( strtolower( $to_encode ) != strtolower( $now_encode ) ){

$string = mb_convert_encoding( $string, $to_encode, $now_encode );

}

return $string;

}

/**

 * 检测字符串当前编码

 *

 * @param string $string 需要检测的字符串

 * @access public

 * @return string 字符编码:UTF-8,...

 */

function detect_encode( $string ){

//$encodes = array( 'CP936', 'UTF-8', 'ASCII', 'GBK', 'GB2312' );

$encodes = array( 'ASCII', 'UTF-8', 'GBK', 'GB2312', 'CP936' );

$now_encode = mb_detect_encoding( $string, $encodes );

return $now_encode;

}