<?php
class Utils {/*** 主要是调用filter_var_array验证，再扩充一个required字段来表示必填项。* http://www.php.net/manual/zh/book.filter.php* 注意: (可以不传，但不能传错)*  1.先验证格式，有失败的抛异常。*  2.未传的参数，有default的(不管是否required=1)，则设置为default值。* 示例:*      $filterArr = array(*          "pn" =>array(*              "required"  => 1,*              "filter"    => FILTER_VALIDATE_INT,*              "options"   => array(*                  "default"   =>1,*                  "min_range" =>1,*              )*          )*      )*/
public static function filter_param($paramArr, $filterArr){$res = filter_var_array($paramArr, $filterArr);     //参数不合法-flase, 没传参数-nullforeach($res as $key=>$val){//如果有验证失败的，抛出异常。if(false === $val){throw new Exception( "Utils::filter_param: failed, key=$key ");}//再判断未传的参数。if( is_null($val)){//1.如果是必填项if($filterArr[$key]['required'] ){if(isset($filterArr[$key]['options']['default'])){//1.1如果有default值，则设置为default值。$res[$key] = $filterArr[$key]['options']['default'];}else{//1.2如果没有default值，抛出异常。throw new Exception( "Utils::filter_param: Do not have required param, key=$key" );}}else{//$res[$key]='';      //这里是默认把null值改为空值。是否有必要?}}}return $res;
}
};//每个model里，都写个checkParam函数，用来配置验证的规则。function checkParam($arrInput){//1.先检查catId$filter = array(//数字类型的，必填。只允许 0-1。"catId" => array("required"=>1,"filter"=>FILTER_VALIDATE_INT,"options"=>array("min_range" =>0,"max_range" =>1,)),//字符串类型的，必填。长度大于1。"title" => array("required"=>1,"filter"=>FILTER_VALIDATE_REGEXP,"options"=>array("regexp" =>"/^.+/",)),//字符串类型的，非必填。但要是填了的话，则格式必须为email。"email" => array("filter"=>FILTER_VALIDATE_EMAIL,),);$_res = Utils::filter_param($arrInput, $filter) ;}//比如这个是输入的参数。可以试着修改这里看看效果。$arrInput=array('catId'=>1,'title'=>'xx','email'=>'xxxxxx.com',);try{$res=checkParam($arrInput);echo "验证通过，继续其它代码...\n";}catch(Exception $e){echo 'Caught exception: ',  $e->getMessage(), "\n";}
?>