My php script outputs a blank page - php

Question

I have a php page that accepts and processes a form submission, the page displays normally when it is requested, however if the page is submitted and its form validation fails, the page suppose to be re-displayed with the form errors, but on page re-display, php displays a blank page when it reaches the error processing block. Here is the code that processes the validation errors:
<?php if(isset($errorLog) and is_array($errorLog)): ?>
<div class="alert alert-danger">
<?php $output = '';
if($errorLog['message'] == '') {
$output = "<ul class='error-list'>";
foreach($errorLog as $key => $value) {
if ($key != 'has_error_occured') {
$output .= "<li><strong>{html($key)}</strong>
<span>{html($value)} </span></li>";
}
}
$output .= "</ul>";
} else {
$msg = $errorLog['message'];
$output .= "<p>{html($msg)}</p>";
}
echo $output;
?>
</div>
<?php endif; ?>
and here is the code that processes the form submission
if(isset($_GET['transfer']) or
(isset($_POST['action']) and $_POST['action'] == TRANSFER)){
$transfer_type = $_GET['ttype'];
if(isset($_POST['action']) and
$_POST['action'] == TRANSFER){
//process money transfer.
$log = process_transfer();
if(isset($log) and is_array($log)){
if($log['has_error_occured']){
$_SESSION['error_log'] = $log;
//unset log
unset($log);
include_once $docRoot . '/users/temp/tranfer.html.php';
exit();
}else{
$_SESSION['transfer_msg'] = "Your international
transfer was processed successfully";
header('Location: ?summary');
}
}
//reload primary page.
header('Location: .');
}else{
include_once $docRoot . '/users/temp/tranfer.html.php';
exit();
}
}
Note:
I have tried passing the error array as a global variable as
you can see in the code snippet above.
I have also tried passing it in a session.
I also have tried using output buffering by appending the ob_start() at the beginning and ob_end_flush() at the end the form script.
I have also added error_reporting(-1); ini_set('display_errors', true); at the start of the form script so as to know if the page encounters any error during processing, all to no avail.
I am using PhpStorm with XAMPP v3.2.1 for development on windows 7.
Please, any help as to the cause of this nightmare will be appreciated. Thanks.

Answer 1

If you wanna use $_GET and $_POST then better use $_REQUEST, it allows to access both $_GET and $_POST
not TRANSFER but it should be "TRANSFER"
if errorlog is session data then it should be
if(isset($_SESSION['errorLog']) and is_array($_SESSION['errorLog'])):
i didn't find any thing created by name message
if($errorLog['message'] == '')
why u used it, i think it must be 'has_error_occured'

Answer 2

I discovered the problem through the output of php_error_log and through the various suggestions in the comments above, the problem problem was that I didn't check if the $erroLog['message'] was set before accessing it. But shouldn't php have outputted a warning instead of resorting to such indeterminate option of not fully executing the rest of the document?