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php daddslashes()和 saddslashes()有哪些区别分析

Jun 13, 2016 am 11:56 AM
get php analyze the difference and Which have automatic escape filter

//GPC过滤,自动转义$_GET,$_POST,$_COOKIE中的特殊字符,防止SQL注入攻击
$_GET = saddslashes($_GET);
$_POST = saddslashes($_POST);

复制代码 代码如下:


下面是daddslashes()和 saddslashes()的例子eg: saddslashes function daddslashes($string, $force = 0, $strip = FALSE) {
//字符串或数组 是否强制 是否去除
//如果魔术引用未开启 或 $force不为0
if(!MAGIC_QUOTES_GPC || $force) {
if(is_array($string)) { //如果其为一个数组则循环执行此函数
foreach($string as $key => $val) {
$string[$key] = daddslashes($val, $force);
}
} else {
//如果魔术引用开启或$force为0
//下面是一个三元操作符,如果$strip为true则执行stripslashes去掉反斜线字符,再执行addslashes
//$strip为true的,也就是先去掉反斜线字符再进行转义的为$_GET,$_POST,$_COOKIE和$_REQUEST $_REQUEST数组包含了前三个数组的值
//这里为什么要将$string先去掉反斜线再进行转义呢,因为有的时候$string有可能有两个反斜线,stripslashes是将多余的反斜线过滤掉
  $string = addslashes($strip ? stripslashes($string) : $string);
}
}
return $string;
}eg: saddslashes function saddslashes($string) { if(!MAGIC_QUOTES_GPC){
if(is_array($string)) { //如果转义的是数组则对数组中的value进行递归转义
    foreach($string as $key => $val) {
      $string[$key] = saddslashes($val);
      }
} else {
    $string = addslashes($string); //对单引号(')、双引号(")、反斜线(\)与 NUL(NULL 字符),进行转义
}
return $string;
}else{
return $string;
}


主要就是:
saddslashes可以实现对每一个数据进行转义处理了

复制代码 代码如下:


function saddslashes($string) {
if(is_array($string)) {
foreach($string as $key => $val) {
$string[$key] = saddslashes($val);
}
} else {
$string = addslashes($string);
}
return $string;
}

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