Catching errors

custom_error_handler.php

<?php

/**
 * Function to run on script shutdown
 * -used to catch most fatal errors, and
 * display them cleanly
 *
 * @return void
 */
function shutdown()
{
    // Catch the last error
    $error = error_get_last();

    // types of errors that are fatal
    $fatal = array(E_ERROR, E_PARSE, E_RECOVERABLE_ERROR);

    // Display pretty error page
    if (in_array($error['type'], $fatal))
    {
        $file = $error['file']);

        $err_msg = "<h2>Fatal Error: </h2>
		{$error['message']}<br /><br />
		<strong>File:</strong> {$file}<br /><br />
		<strong>Line:</strong> {$error['line']}";

        show_error($err_msg);
    }
}

// Runs at execution shutdown
register_shutdown_function('shutdown');

/**
 * Convert errors to exceptions
 *
 * @param int $severity
 * @param string $message
 * @param string $filepath
 * @param int $line
 * @return ErrorException
 */
function on_error($severity, $message, $filepath, $line)
{
    throw new \ErrorException($message, 0, $severity, $filepath, $line);
}

// Runs on any error
set_error_handler('on_error');