PHP redbox for errors

_redbox.php

<?php
$errors = array();

function redbox($no, $str, $file, $line) {
  global $errors;
  $errors[] = array(
    'no' => $no,
    'str' => $str,
    'file' => $file,
    'line' => $line,
  );
}

set_error_handler("redbox");
?>

footer.php

<?php
global $errors;
if (!empty($errors)): ?>
  <div class="redbox">
    <ul>
    <?php foreach($errors as $error): ?>
      <li>
      [<?php echo $error['no']; ?>] <?php echo $error['str']; ?><br />
      Error on line <?php echo $error['line']; ?> in <?php echo $error['file']; ?>
      </li>
    <?php endforeach; ?>
   </ul>
 </div>
<?php endif; ?>

redbox.css

.redbox {
  overflow-y: auto;
  position: fixed;
  background: #e91e00;
  color: #fff;
  z-index: 999;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.redbox ul {
  margin-top: -40px;
}

.redbox li {
  padding-top: 40px; 
}

This sets a custom error handler, which collects the errors into an associative array, allowing you to output them elsewhere. This UI is similar to the redbox, common in JavaScript, etc. Ensures you have less runtime errors.

This could really do with a stack trace, lol