php实现utf-8转unicode函数分享

代码很简单，功能却很实用，推荐给大家。

奉上代码先：

public function utf8_unicode($str) {

    $unicode = array();

    $values = array();

    $lookingFor = 1;

    for ($i = 0; $i < strlen( $str ); $i++ ) {

        $thisValue = ord( $str[ $i ] );

        if ( $thisValue < ord('A') ) {

            // exclude 0-9

            if ($thisValue >= ord('0') && $thisValue <= ord('9')) {

                 // number

                 $unicode[] = chr($thisValue);

            }

            else {

                 $unicode[] = '%'.dechex($thisValue);

            }

        } else {

            if ( $thisValue < 128) {

                $unicode[] = $str[ $i ];

            } else {

                if ( count( $values ) == 0 ) {

                    $lookingFor = ( $thisValue < 224 ) ? 2 : 3;

                }

                $values[] = $thisValue;

                if ( count( $values ) == $lookingFor ) {

                    $number = ( $lookingFor == 3 ) ?

                        ( ( $values[0] % 16 ) * 4096 ) + ( ( $values[1] % 64 ) * 64 ) + ( $values[2] % 64 ):

                        ( ( $values[0] % 32 ) * 64 ) + ( $values[1] % 64 );

                    $number = dechex($number);

                    $unicode[] = (strlen($number)==3)?"\u0".$number:"\u".$number;

                    $values = array();

                    $lookingFor = 1;

                } // if

            } // if

        }

    } // for

    return implode("",$unicode);

}