PHP encapsulated Form Validation class complete instance _php tips

This example describes the form validation classes that are encapsulated in PHP. Share to everyone for your reference, specific as follows:

<?php
//Package a form verification class//
Chinese verification, mailbox verification, telephone number, mobile phone, QQ, ID card, (composed of letters, numbers, underscores, can not start with a number)
header (' content-type:text/ Html;charset=utf-8 ');
Class form{
 ///Chinese authentication method
 //parameter: $STR, $num 1, $num 2
 //return value: Matching number of successful matches returned
 /Public function Checkchina ($str, $num 1, $num 2= ') {
  //regular
 $reg = '/^[\x{4e00}-\x{9fa5}]{'. $num 1. ', '. $num 2. '} '. ' $/u ';
 Return Preg_match ($reg, $str);
 }
 ///
 Mailbox Verification
 //parameters: $email
 //return value: Matching number of successful matches returned/public
 function Checkemail ($email) {
 // Regular
 $reg = '/^\w+@\w+[.] com|cn|net$/';
 Return Preg_match ($reg, $email);
 }
 ///
 Verify ID
 //parameter $card
 //Return value: Number of matches successfully returned
 * * Public
 function Checkcard ($card) {
 //Regular
 $reg = '/^ (\d{18}|\d{17}x) $/';
 Return Preg_match ($reg, $card);
 }
 ///
 require that the input be composed of numbers, letters, underscores, cannot begin with a number, has a bit limit
 //parameter: $STR, $num 1, $num 2
 //return value: The number
 of matches successfully returned. Public Function Checkstr ($STR, $num 1, $num 2) {
 //regular
 $reg = '/^[a-za-z_]\w{'. ( $num 1-1). ', '. ($num 2-1). '} $/';
 Return Preg_match ($reg, $str);
 }

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