This is a form data validation class implemented through a piece of PHP code. It is a very easy-to-use and convenient form data validation class
<?php
//验证类
class Fun{
function isEmpty($val)
{
if (!is_string($val)) return false; //是否是字符串类型
if (empty($val)) return false; //是否已设定
if ($val=='') return false; //是否为空
return true;
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