PHP之SQL防注入代码集合(建站常用)

SQL防注入代码一

<?php
if (!function_exists (quote))
{
function quote($var)
{
if (strlen($var))
{
$var=!get_magic_quotes_gpc() ? $var : stripslashes($var);
$var = str_replace("'","'",$var);
}
return "'$var'";
}
}
if (!function_exists (hash_num)){
function hash_num($input)
{
$hash = 5381;
for ($i = 0; $i < strlen($str); $i++)
{
$c = ord($str{$i});
$hash = (($hash << 5) + $hash) + $c;
}
return $hash;
}
}
?>

<?php
include_once('common.php');
var_dump(hash_num('dddd'));
if(empty($_GET))
{
$_GET = array('age'=>'99','name'=>'a'b\'c";','note'=>"a'b'nc#");
}
$age = (int)$_GET['age'];
$name = quote($_GET['name']);
$note = quote($_GET['note']);
$sql = "INSERT INTO `tb` ( `age`, `name`, `note`) VALUES
( $age, $name, $note)";
var_dump($sql);
?>

SQL防注入代码二

<?php
$magic_quotes_gpc = get_magic_quotes_gpc();
@extract(daddslashes($_COOKIE));
@extract(daddslashes($_POST));
@extract(daddslashes($_GET));
if(!$magic_quotes_gpc) {
$_FILES = daddslashes($_FILES);
}

function daddslashes($string, $force = 0) {
if(!$GLOBALS['magic_quotes_gpc'] || $force) {
if(is_array($string)) {
foreach($string as $key => $val) {
$string[$key] = daddslashes($val, $force);
}
} else {
$string = addslashes($string);
}
}
return $string;
}
?>

SQL防注入代码三

function inject_check($sql_str)

{
$check = eregi('select|insert|update|delete|'|/*|*|../|./|union|into|load_file|outfile', $sql_str);
if ($check)

{
echo "输入非法注入内容！";
exit ();
}

else

{
return $sql_str;
}
}
function checkurl()

{
if
(preg_replace("/https教程?://([^:/]+).*/i", "1",
$_server['http_referer']) !== preg_replace("/([^:]+).*/", "1",
$_server['http_host'])) {
header("location: http://s.jb51.net");
exit();
}
}

checkurl();
$str = $_get['url'];
inject_check($sql_str);

摘自：http://www.codesky.net/article/201202/164551.html