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php method to stop submission: 1. Create a PHP sample file; 2. Pass "if(empty($user)){
echo '4058752f785d925a16739924810b6e62alert("...");}" method can be used to stop data submission.
The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.
How to stop submission in php?
Specific problem description:
How to stop submission if php verification fails?
I performed non-null verification on the registration page. After prompting that the user name cannot be empty, the form was still submitted. How can I prevent the form from being submitted?
Solution:
The code is as follows:
<?php
$user=$_POST['user']?$_POST['user']:'';
if(empty($user)){
echo '<script type="text/javascript">alert("用户名不能为空");history.back(-1);</script>';
}
?>Recommended learning: "PHP Video Tutorial"
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