PHP數據過濾函數

<?php

/* 全局安全處理 */

switch ($_GET['task'])
{
case 'print_form':
include '/inc/presentation/form.inc';
break;

case 'process_form':
$form_valid = false;
include '/inc/logic/process.inc';
if ($form_valid)
{
include '/inc/presentation/end.inc';
}
else
{
include '/inc/presentation/form.inc';
}
break;

default:
include '/inc/presentation/index.inc';
break;
}

?>

<?php

switch ($_POST['form'])
{
case 'login':
$allowed = array();
$allowed[] = 'form';
$allowed[] = 'username';
$allowed[] = 'password';

$sent = array_keys($_POST);

if ($allowed == $sent)
{
include '/inc/logic/process.inc';
}

break;
}

?>

<?php

$clean = array();

$email_pattern = '/^[^@s<&>]+@([-a-z0-9]+.)+[a-z]{2,}$/i';

if (preg_match($email_pattern, $_POST['email']))
{
$clean['email'] = $_POST['email'];
}

?>

<?php

$clean = array();

switch ($_POST['color'])
{
case 'red':
case 'green':
case 'blue':
$clean['color'] = $_POST['color'];
break;
}

?>

<?php

$clean = array();

if ($_POST['num'] == strval(intval($_POST['num'])))
{
$clean['num'] = $_POST['num'];
}

?>

<?php

$clean = array();

if ($_POST['num'] == strval(floatval($_POST['num'])))
{
$clean['num'] = $_POST['num'];
}

?>

<?PHP 
//PHP整站防注入程序，需要在公共文件中require_once本文件 
//判斷magic_quotes_gpc狀態 
if (@get_magic_quotes_gpc ()) { 
$_GET = sec ( $_GET ); 
$_POST = sec ( $_POST ); 
$_COOKIE = sec ( $_COOKIE ); 
$_FILES = sec ( $_FILES ); 
} 
$_SERVER = sec ( $_SERVER ); 
function sec(&$array) { 
//如果是數組，遍歷數組，遞歸調用 
if (is_array ( $array )) { 
foreach ( $array as $k => $v ) { 
$array [$k] = sec ( $v ); 
} 
} else if (is_string ( $array )) { 
//使用addslashes函數來處理 
$array = addslashes ( $array ); 
} else if (is_numeric ( $array )) { 
$array = intval ( $array ); 
} 
return $array; 
} 
//整型過濾函數 
function num_check($id) { 
if (! $id) { 
die ( '參數不能為空！' ); 
} //是否為空的判斷 
else if (inject_check ( $id )) { 
die ( '非法參數' ); 
} //注入判斷 
else if (! is_numetic ( $id )) { 
die ( '非法參數' ); 
} 
//數字判斷 
$id = intval ( $id ); 
//整型化 
return $id; 
} 
//字符過濾函數 
function str_check($str) { 
if (inject_check ( $str )) { 
die ( '非法參數' ); 
} 
//注入判斷 
$str = htmlspecialchars ( $str ); 
//轉換html 
return $str; 
} 
function search_check($str) { 
$str = str_replace ( "_", "_", $str ); 
//把"_"過濾掉 
$str = str_replace ( "%", "%", $str ); 
//把"%"過濾掉 
$str = htmlspecialchars ( $str ); 
//轉換html 
return $str; 
} 
//表單過濾函數 
function post_check($str, $min, $max) { 
if (isset ( $min ) && strlen ( $str ) < $min) { 
die ( '最少$min字節' ); 
} else if (isset ( $max ) && strlen ( $str ) > $max) { 
die ( '最多$max字節' ); 
} 
return stripslashes_array ( $str ); 
} 
//防注入函數 
function inject_check($sql_str) { 
return eregi ( 'select|inert|update|delete|'|/*|*|../|./|UNION|into|load_file|outfile', $sql_str ); 
// www.111cn.net 進行過濾，防注入 
} 
function stripslashes_array(&$array) { 
if (is_array ( $array )) { 
foreach ( $array as $k => $v ) { 
$array [$k] = stripslashes_array ( $v ); 
} 
} else if (is_string ( $array )) { 
$array = stripslashes ( $array ); 
} 
return $array; 
} 
?>