Form Validation in PHP

PHP Introduction

Working with Forms

PHP with MySQl

Advanced PHP

Object Oriented PHP

PHP from validation may be used to safe page website from spammer or hackers.

To prevent from invalid input some attributes in html tags like required. Java script may also be used for client server validation . while php validation is used for server side validation.

isset() in php

<html>
<body bgcolor="gray"><center>
<?php
if(isset($submitbtn))
{
 echo "this print only when submitbtn is clicked";
}
?>
<form>
<input type="submit" name="ok" value="Click">
</form>
</center>
</body>
</html>

ro prevent to execute the php code on load of the page but when submitbtn is clicked then php script is executed.

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Form validation in PHP

isset() in php

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