PHP encapsulated form validation class

This article mainly introduces the form verification class encapsulated by PHP, and analyzes PHP's related operating techniques for regular verification and type determination of form elements in the form of a complete example. It has certain reference value for the security of PHP programming. It is needed Friends can refer to

for details as follows:

<?php
//封装一个表单验证类
//中文验证、邮箱验证、电话号码、手机、QQ、身份证、(由字母、数字、下划线组成，不能以数字开头）
header(&#39;content-type:text/html;charset=utf-8&#39;);
class Form{
 /*
 //中文验证的方法
 //参数：$str,$num1,$num2
 //返回值:匹配成功返回匹配的次数
 */
 public function checkChina($str,$num1,$num2=&#39;&#39;){
  //正则
 $reg=&#39;/^[\x{4e00}-\x{9fa5}]{&#39;.$num1.&#39;,&#39;.$num2.&#39;}&#39;.&#39;$/u&#39;;
 return preg_match($reg,$str);
 }
 /*
 //邮箱验证
 //参数：$email
 //返回值: 匹配成功返回匹配的次数
 */
 public function checkEmail($email){
 //正则
 $reg=&#39;/^\w+@\w+[.]com|cn|net$/&#39;;
 return preg_match($reg,$email);
 }
 /*
 //验证身份证
 //参数 $card
 //返回值: 匹配成功返回匹配的次数
 */
 public function checkCard($card){
 //正则
 $reg=&#39;/^(\d{18}|\d{17}x)$/&#39;;
 return preg_match($reg,$card);
 }
 /*
 //要求输入内容由数字、字母、下划线组成，不能以数字开头，有位数限制
 //参数：$str,$num1,$num2
 //返回值: 匹配成功返回匹配的次数
 */
 public function checkStr($str,$num1,$num2){
 //正则
 $reg=&#39;/^[a-zA-Z_]\w{&#39;.($num1-1).&#39;,&#39;.($num2-1).&#39;}$/&#39;;
 return preg_match($reg,$str);
 }
}

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