PHP Filter String Function Example

Class Request { Public Function __construct () { if (!GET_MAGIC_QUOTES_GPC ()) { if (!empty ($_post)) { foreach ($_post as $k = & $v) { if (Is_array ($v)) { @array_walk ($v, ' urldecode '); @array_walk ($v, ' addslashes '); } Else { $v = Addslashes (UrlDecode ($v)); } $p [$k] = $v; } $_post = $p; Unset ($p); } if (!empty ($_get)) { foreach ($_get as $k = & $v) { if (Is_array ($v)) { @array_walk ($v, ' urldecode '); @array_walk ($v, ' addslashes '); } Else { $v = Addslashes (UrlDecode ($v)); } $g [$k] = $v; } $_get = $g; Unset ($G); } } } public static function Getquery ($key) { if (Isset ($_get[$key])) { Return Self::xss_clean ($_get[$key]); } Else { return false; } } public static function Getpost ($key) { if (Isset ($_post[$key])) { Return Self::xss_clean ($_post[$key]); } Else { return false; } } public static function Getserver ($key) { $key = Strtoupper ($key); if (Isset ($_server[$key])) { Return Self::xss_clean ($_server[$key]); } return false; } public static function GetSession ($key) { if (Isset ($_session[$key])) { Return Self::xss_clean ($_session[$key]); } Else { return false; } } public static function GetCookie ($key) { if (Isset ($_cookie[$key])) { return $_cookie[$key]; } Else { return false; } } /** * Filter illegal characters (distribute) */ private static function Xss_clean ($STR) { if (Is_array ($STR) &&!empty ($str)) { $str = Self::xss_clean_arr ($STR); } else { $str = Self::xss_clean_str ($STR); } return $str; } /** * Filter illegal characters (arrays) */ private static function Xss_clean_arr ($STR) { foreach ($str as $key = = $val) { if (Is_array ($val)) { $val = Self::xss_clean_arr ($val); } else { $val = Self::xss_clean_str ($val); } $arr [$key] = $val; } return $arr; } /** * Filter Illegal characters (string) */ private static function Xss_clean_str ($STR) { $str = Preg_replace (' # (alert|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents| Readfile|unlink) (\s*) \ ((. *?) \) #si ', "\\1\\2 (\\3)", $str); if (GET_MAGIC_QUOTES_GPC ()) { return $str; } else { Return addslashes ($STR); } } } Copy Code

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