将函数从preg_replace转换为preg_replace_callback()

时间:2014-10-14 21:13:52

标签: php preg-replace sanitization preg-replace-callback

我需要在过时的CMS扩展程序的此函数中将preg_replace()转换为preg_replace_callback():

// santizes a regex pattern
private static function sanitize( $pattern, $m = false, $e = false ) {
    if( preg_match( '/^\/(.*)([^\\\\])\/(.*?)$/', $pattern, $matches ) ) {
        $pat = preg_replace(
            '/([^\\\\])?\(\?(.*\:)?(.*)\)/Ue',
            '\'$1(?\' . self::cleanupInternal(\'$2\') . \'$3)\'',
            $matches[1] . $matches[2]
        );
        $ret = '/' . $pat . '/';
        if( $m ) {
            $mod = '';
            foreach( self::$modifiers as $val ) {
                if( strpos( $matches[3], $val ) !== false ) {
                    $mod .= $val;
                }
            }
            if( !$e ) {
                $mod = str_replace( 'e', '', $mod );
            }
            $ret .= $mod;
        }
    } else {
        $pat = preg_replace(
            '/([^\\\\])?\(\?(.*\:)?(.*)\)/Ue',
            '\'$1(?\' . self::cleanupInternal(\'$2\') . \'$3)\'',
            $pattern
        );
        $pat = preg_replace( '!([^\\\\])/!', '$1\\/', $pat );
        $ret = '/' . $pat . '/';
    }
    return $ret;
}

我只能想象这个功能的作用。我尝试了这个,但它没有工作:

private static function sanitize( $pattern, $m = false, $e = false ) {
    if( preg_match( '/^\/(.*)([^\\\\])\/(.*?)$/', $pattern, $matches ) ) {
        $pat = preg_replace_callback(
            '/([^\\\\])?\(\?(.*\:)?(.*)\)/U',
            function($matches) {return CallFunction('\'$1(?\' . self::cleanupInternal(\'$2\') . \'$3)\''); },
            $matches[1] . $matches[2]
        );
        $ret = '/' . $pat . '/';
        if( $m ) {
            $mod = '';
            foreach( self::$modifiers as $val ) {
                if( strpos( $matches[3], $val ) !== false ) {
                    $mod .= $val;
                }
            }
            if( !$e ) {
                $mod = str_replace( 'e', '', $mod );
            }
            $ret .= $mod;
        }
    } else {
        $pat = preg_replace_callback(
            '/([^\\\\])?\(\?(.*\:)?(.*)\)/U',
        function($matches) {return CallFunction('\'$1(?\' . self::cleanupInternal(\'$2\') . \'$3)\''); },
            $pattern
        );
        $pat = preg_replace( '!([^\\\\])/!', '$1\\/', $pat );
        $ret = '/' . $pat . '/';
    }
    return $ret;
}

有人可以帮我吗?

1 个答案:

答案 0 :(得分:1)

没有任何确定,您可以尝试第一个preg_replace,并以相同的方式修改第二个preg_replace:

$that = $this;
$pat = preg_replace_callback(
            '/([^\\\\])?\(\?(.*:)?(.*)\)/U',
            function ($m) use ($that) {
                return  $m[1] . '(?' . $that->cleanupInternal($m[2]) . $m[3];
            },
            $matches[1] . $matches[2]
);

作为旁白评论,我认为([^\\\\])?没有任何意义或对某些内容有用,因为它是可选的,并且在相同位置的替换字符串中重用。