Run a PHP function before completing a form submit!

[leeh14]

Hi,

 

I wouder if someone can help me with this issue? I want a user to click submit on a form which posts the data of to a processing page! but i only want a user to be taken to the processing page if the data in the fields passes some vailation. If the data does not pass the validation error message appear!

 

What way could this be done?

[gawdz]

This displays the error

if(isset($error)){
	echo  $error;
	}

This can be called in a different php file and will display an error if given one.

if(isset($_POST['stuff'])){
	$text = $_POST[text];
if($text != null){
$error = $text;
} else {
$error = "error: text is null";
}
}

[menator]

It would help if you could post the code you have