Posted By

brownrl on 06/19/09

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Last Edited at 06/19/09 05:16am

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PHP Form Validation

/ Published in: PHP

This is a good way to validate form input from PHP, in essence this could be a blue print for your forms.

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<?php

//  Quick function to loop through regexs and compare to what is in _POST
//  
//  $regs    ->   associative array of regular expressions
//  $ferrors ->   error messages to display to the users asociative array

function validatePost( $regs , $ferrors )
{
	$errors = array();
	foreach( $regs as $k => $v )
	{
		if( ! preg_match( $v , $_POST[$k] ) )
		{
			$errors[$k] = $ferrors[$k];
		}
	}
	return $errors;
}

// has the post been submitted?
if( count( $_POST ) )
{
	// yes it has been submitted so lets validate
	$regs['last_name']  = "/^[[:alpha:]\ -]+$/";  // require a alpha
	$regs['first_name'] = "/^[[:alpha:]\ -]+$/";  // require a alpha
	$regs['email']      = "/^..*\@..*$/";         // VERY simple email check
	                                            // Use google to find better

// Ok here are the error message to display when it is bad
	$ferrors['last_name']  = "Last name required";
	$ferrors['first_name'] = "First name required";
	$ferrors['email']      = "Email name required";

$errors = validatePost( $regs , $ferrors );

// Do we have errors?
	if( count( $errors ) == 0 )
	{
		//  WE HAVE NO ERRORS DO SOMETHING
		//  PUT IT INTO THE DATABASE, EMAIL, BOUNCE THE USER
		//  TO A THANK YOU PAGE, ETC...
	}
}
?>

<p>
<label>First Name</label>
<input type="text" name="first_name" value="<?= $_POST['first_name'] ?>" />
<span style="color: #FF0000;"><?= $errors['first_name'] ?></span>
</p>

<p>
<label>Email</label>
<input type="text" name="email" value="<?= $_POST['email'] ?>" />
<span style="color: #FF0000;"><?= $errors['email'] ?></span>
</p>

</form>

URL: http://www.goingson.be/2009/05/my-super-awesome-php-functions-part-v.html

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