Validation using php

don_log · #1 (**permalink**) 05-31-10, 03:37

i want to do form validation using php when field left empty and submit a form
if field is empty then show fill in the name on this page like this

ProphetX · #2 (**permalink**) 06-01-10, 06:04

The most basic approach you can use is manually validating each field and returning an error message if validation fails:

PHP Code:


			
<?php
if (isset($_POST['submit']))
{
    $success = TRUE;

    //Put each $_POST value into its own array
    foreach ($_POST as $key => $val)
    {
        $$key = $val;
    }

    //Form validation starts here
    if (empty($message))
    {
        $success = FALSE;
        $message_error = 'The message field cannot be empty.';
    }

    if ($success == TRUE) redirect('/success_page.php');
}
?>

<form action="this_page.php">
<label for="message">Name:</label> <input type="text" name="message" id="message" value="<?=$message?>" />
<?php if (!empty($message_error)) echo $message_error; ?>

<br />
<input type="submit" name="submit" value="Send Message" />
</form>

There are loads of nice validation libraries available that will take care of the hard work for you. CodeIgniter is an MVC framework that has a great validation library - definitely worth checking out.

saviola · #3 (**permalink**) 06-01-10, 06:45

If you don't want to do verification of all form fields, you just can register an array and its keys have to be composite from require fields name like keys ...

PHP Code:


			
<?php



$reauireFields = array('fieldOne', 'fieldTwo');

if (isset($_POST['submit']))

{

    $success = TRUE;



    foreach ($reauireFields as $key => $val)

    {

        if(empty($_POST[$key])) {

            $success = FALSE;

            $message_error[$key] = 'The message field cannot be empty.';

        }

    }



    if ($success == TRUE) redirect('/success_page.php');

}

?>



<form action="this_page.php">

    <label for="fieldOne">fieldOneName:</label> 

    <input type="text" name="fieldOne" id="fieldOne" value="<?=$_POST['fieldOne']?>" />

<?php if (!empty($message_error['fieldOne'])) echo $message_error['fieldOne']; ?>



<br />

<input type="submit" name="submit" value="Send Message" />

</form>

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