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HomeBackend DevelopmentPHP Tutorial怎么实现一个php框架系列文章【5】安全处理输入

如何实现一个php框架系列文章【5】安全处理输入

所有的外部输入参数都应该检查合法性。

未正确处理输入数据将可能导致sql注入等漏洞。

 

框架提供系列函数来取$_REQUEST中的值

requestInt

requestString

requestFloat

requestBool

 

ps:注意$_REQUEST中变量类型可能会是数组

如请求为 ?i[]=1,那么$_REQUEST['i'] 的值为array(1)

做校验的时候要考虑全面以防止php warning信息泄露

 

 

另外再介绍一下kv json格式的数据校验。

有时为了在项目中保留一定扩展性,会使用json格式的数据,这种数据又该如何校验呢。

 

//校验键值形式{k1:v1, k2:v2, k3:v3 ...}的json数据,可以对每一对kv进行校验

requestKvJson

 

 

 

 

部分实现代码

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//校验整数,失败返回$default
function checkInt($var$default = 0) {
    return  is_numeric($var) ? intval($var, (strncasecmp($var'0x', 2) == 0 || strncasecmp($var'-0x', 3) == 0) ? 16 : 10) : $default;
}
 
//校验字符串 $check为正则表达式
function checkString($var$check ''$default '') {
    if (!is_string($var)) {
        if(is_numeric($var)) {
            $var = (string)$var;
        }
        else {
            return $default;
        }
    }
    if ($check) {
         return (preg_match($check$var$ret) ? $ret[1] : $default);
    }
 
    return $var;
}
 
/*
    校验kv json,
    如果想要一个这样的数据{id:1, 'type':'single_text', 'required': true, 'desc':'this is a text'}
    那么$desc可以这样写
    array(
   array('id', 'Int'),
   array('type', 'string', PATTERN_NORMAL_STRING),
   array('required', 'Bool', false),
   array('desc', 'string', PATTERN_NORMAL_STRING),
))
*/
function checkKvJson($var$desc array()) {
    if(is_string($var)) {
        $var = json_decode($var, true);
    }
    if(!$var || !is_array($var)) {
        return array();
    }
 
    if($desc)
    foreach($desc as $d) {
 
        if(!isset($var[$d[0]])) {
            return array();
        }
 
        $ps array_slice($d, 2);
        array_unshift($ps$var[$d[0]]);
        $var[$d[0]] = call_user_func_array('check'.$d[1], $ps);
        if($var[$d[0]] === false && strcasecmp($d[1], 'Bool')) {
            return array();
        }
    }
 
    return $var;
}
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