代码很简单，功能却很实用，推荐给大家。
奉上代码先：
复制代码 代码如下:
public function utf8_unicode($str) {
    $unicode = array();
    $values = array();
    $lookingfor = 1;
    for ($i = 0; $i         $thisvalue = ord( $str[ $i ] );
        if ( $thisvalue             // exclude 0-9
            if ($thisvalue >= ord('0') && $thisvalue                  // number
                 $unicode[] = chr($thisvalue);
            }
            else {
                 $unicode[] = '%'.dechex($thisvalue);
            }
        } else {
            if ( $thisvalue                 $unicode[] = $str[ $i ];
            } else {
                if ( count( $values ) == 0 ) {
                    $lookingfor = ( $thisvalue                 }
                $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);
}