Using same rules for jQuery validation on server-side (PHP)

There are lots of array functions in PHP.  If you can show us some of the data and show us what you want to get out of it, I may be able to give you a tested and working example.  And don't overlook the various PHP frameworks -- all of them (WordPress, Joomla, CodeIgniter, Drupal, Laravel) have form validation routines.

A sample of server-side validation using plain-old PHP:

<?php // demo/form_highlight_errors.php
error_reporting(E_ALL);

/**
 * DEMONSTRATE HOW TO HIGHLIGHT ERRORS IN FORM INPUT, AND REMEMBER VALID INPUTS
 * CLIENT IS ASKED TO PUT IN A VALUE
 * IF THE VALUE FAILS OUR TEST WE SHOW AN ERROR MESSAGE
 * WE PUT A MARKER NEXT TO THE INPUT CONTROL ON THE FORM
 * WE TURN THE FORM BORDER RED
 * SEE http://www.w3schools.com/CSS/pr_class_visibility.asp
 */


// THESE STYLE ELEMENTS ARE SET FOR THE SCRIPT INITIALIZATION
$error_abc = $error_xyz = $error_any = 'hidden';
$boxer_abc = $boxer_xyz              = 'black';


// CAPTURE AND NORMALIZE THE POST VARIABLES - ADD YOUR OWN SANITY CHECKS HERE
$abc = (isset($_POST["abc"])) ? trim(strtoupper($_POST["abc"])) : NULL;
$xyz = (isset($_POST["xyz"])) ? trim(strtoupper($_POST["xyz"])) : NULL;


// IF ANYTHING WAS POSTED, VALIDATE IT
if (!empty($_POST))
{
    // VALIDATE THE 'abc' FIELD
    if ($abc != 'ABC')
    {
        // VALIDATION FAILED
        $error_abc = $error_any = 'visible';
        $boxer_abc = 'red';

        // BECAUSE THIS FAILED VALIDATION, REMOVE IT FROM THE FORM
        $abc       = NULL;
    }

    // VALIDATE THE 'xyz' FIELD
    if ($xyz != 'XYZ')
    {
        // VALIDATION FAILED
        $error_xyz = $error_any = 'visible';
        $boxer_xyz = 'red';

        // BECAUSE THIS FAILED VALIDATION, REMOVE IT FROM THE FORM
        $xyz       = NULL;
    }

    // DO WE HAVE INPUT FREE FROM ANY ERRORS?
    if ($error_any != 'visible')
    {
        echo "CONGRATULATIONS";
        die();
    }

    // OTHERWISE... OOPS - WE HAVE ERRORS AND MUST SHOW THE FORM AGAIN
}

// IF NOTHING WAS POSTED, OR IF THERE ARE ERRORS, WE NEED NEW CLIENT INPUT
$form = <<<ENDFORM
<style type="text/css" media="all">
.error_any { visibility:$error_any; }
.error_abc { visibility:$error_abc; }
.error_xyz { visibility:$error_xyz; }
</style>
<pre>
<form method="post">
<span class="error_any">PLEASE CORRECT THE FOLLOWING ERRORS</span>
<span class="error_abc">YOU MUST ENTER 'abc' IN THIS FIELD</span>
PLEASE ENTER "ABC" HERE: <input style="border-color:$boxer_abc;" name="abc" value="$abc" />
<span class="error_xyz">YOU MUST ENTER 'xyz' IN THIS FIELD</span>
PLEASE ENTER "XYZ" HERE: <input style="border-color:$boxer_xyz;" name="xyz" value="$xyz" />
<input type="submit" />
</form>
ENDFORM;

// WRITE THE FORM WITH THE APPROPRIATE CSS STYLES ON THE ERROR MESSAGE FIELDS
echo $form;

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