php防止sql注入的代码示例

<?php
Function inject_check($sql_str) {
 return eregi('select|insert|and|or|update|delete|\'|\/\*|\*|\.\.\/|\.\/|union|into|load_file|outfile', $sql_str);
}
if (inject_check($_SERVER['QUERY_STRING'])==1 or inject_check(file_get_contents("php://input"))==1){
 //echo "警告 非法访问！";
 header("Location: Error.php");
}

<?php
$_GET = stripslashes_array($_GET);
$_POST = stripslashes_array($_POST);

//数据过滤函数
function stripslashes_array(&$array) {
 while(list($key,$var) = each($array)) {
  if ($key != 'argc' && $key != 'argv' && (strtoupper($key) != $key || ''.intval($key) == "$key")) {
   if (is_string($var)) {
    $array[$key] = stripslashes($var);
   } // www.jbxue.com
   if (is_array($var))  {
    $array[$key] = stripslashes_array($var);
   }
  }
 }
 return $array;
}

<?php
//防止sql注入
function lib_replace_end_tag($str)
{
 if (empty($str)) return false;
 $str = htmlspecialchars($str);
 $str = str_replace( '/', "", $str);
 $str = str_replace("\\", "", $str);
 $str = str_replace(">", "", $str);
 $str = str_replace("<", "", $str);
 $str = str_replace("<SCRIPT>", "", $str);
 $str = str_replace("</SCRIPT>", "", $str);
 $str = str_replace("<script>", "", $str);
 $str = str_replace("</script>", "", $str);
 $str=str_replace("select","select",$str);
 $str=str_replace("join","join",$str);
 $str=str_replace("union","union",$str);
 $str=str_replace("where","where",$str);
 $str=str_replace("insert","insert",$str);
 $str=str_replace("delete","delete",$str);
 $str=str_replace("update","update",$str);
 $str=str_replace("like","like",$str);
 $str=str_replace("drop","drop",$str);
 $str=str_replace("create","create",$str);
 $str=str_replace("modify","modify",$str);
 $str=str_replace("rename","rename",$str);
 $str=str_replace("alter","alter",$str);
 $str=str_replace("cas","cast",$str);
 $str=str_replace("&","&",$str);
 $str=str_replace(">",">",$str);
 $str=str_replace("<","<",$str);
 $str=str_replace(" ",chr(32),$str);
 $str=str_replace(" ",chr(9),$str);
 $str=str_replace("    ",chr(9),$str);
 $str=str_replace("&",chr(34),$str);
 $str=str_replace("'",chr(39),$str);
 $str=str_replace("<br />",chr(13),$str);
 $str=str_replace("''","'",$str);
 $str=str_replace("css","'",$str);
 $str=str_replace("CSS","'",$str);
 return $str; 
}