form validation

[cs1h]

Hi,

 

Does anyone know if it is possible to validate form fields (i.e. make sure certain sections ae filled in) with php?

 

If it is can anyone tell me how or where I can find out how?

 

Thanks

Colin

[Orio]

You need to use the empty() function.

Learn from this example:

 

<form action="<?php echo basename($_SERVER['PHP_SELF']); ?>" method="POST">
<input type="text" name="field1"><input type="submit" name="submit">
<br>

<?php

if(isset($_POST['submit']))
{
if(empty($_POST['field']))
	echo "<center><font color=red>Fill in the Field!</font></center>";
}

?>

 

Orio.

[BlueSkyIS]

when you submit a form, it is sent via either GET or POST. PHP can then get the values using the name for each form element. For instance, if you have a form that POSTs to a PHP file and one of the form elements is a text field with the name test_field, in the PHP file, you can get the value like this:

 

$a_variable = $_POST['test_field'];

 

Then compare the value of $a_variable to the allowed values. If $a_variable != $allowed_value, display an error. It's the same with GET.