Code to catch all PHP errors which result in 500 Error Code. Include this snippet at the beginning of index.php file

gistfile1.aw

<?php

define('E_FATAL',  E_ERROR | E_USER_ERROR | E_PARSE | E_CORE_ERROR | 
        E_COMPILE_ERROR | E_RECOVERABLE_ERROR);

define('ENV', 'dev');

//Custom error handling vars
define('DISPLAY_ERRORS', TRUE);
define('ERROR_REPORTING', E_ALL | E_STRICT);
define('LOG_ERRORS', TRUE);

register_shutdown_function('shut');

set_error_handler('handler');

//Function to catch no user error handler function errors...
function shut(){

    $error = error_get_last();

    if($error && ($error['type'] & E_FATAL)){
        handler($error['type'], $error['message'], $error['file'], $error['line']);
    }

}

function handler( $errno, $errstr, $errfile, $errline ) {

    switch ($errno){

        case E_ERROR: // 1 //
            $typestr = 'E_ERROR'; break;
        case E_WARNING: // 2 //
            $typestr = 'E_WARNING'; break;
        case E_PARSE: // 4 //
            $typestr = 'E_PARSE'; break;
        case E_NOTICE: // 8 //
            $typestr = 'E_NOTICE'; break;
        case E_CORE_ERROR: // 16 //
            $typestr = 'E_CORE_ERROR'; break;
        case E_CORE_WARNING: // 32 //
            $typestr = 'E_CORE_WARNING'; break;
        case E_COMPILE_ERROR: // 64 //
            $typestr = 'E_COMPILE_ERROR'; break;
        case E_CORE_WARNING: // 128 //
            $typestr = 'E_COMPILE_WARNING'; break;
        case E_USER_ERROR: // 256 //
            $typestr = 'E_USER_ERROR'; break;
        case E_USER_WARNING: // 512 //
            $typestr = 'E_USER_WARNING'; break;
        case E_USER_NOTICE: // 1024 //
            $typestr = 'E_USER_NOTICE'; break;
        case E_STRICT: // 2048 //
            $typestr = 'E_STRICT'; break;
        case E_RECOVERABLE_ERROR: // 4096 //
            $typestr = 'E_RECOVERABLE_ERROR'; break;
        case E_DEPRECATED: // 8192 //
            $typestr = 'E_DEPRECATED'; break;
        case E_USER_DEPRECATED: // 16384 //
            $typestr = 'E_USER_DEPRECATED'; break;

    }

    $message = '<b>'.$typestr.': </b>'.$errstr.' in <b>'.$errfile.'</b> on line <b>'.$errline.'</b><br/>';

    if(($errno & E_FATAL) && ENV === 'production'){

        header('Location: 500.html');
        header('Status: 500 Internal Server Error');

    }

    if(!($errno & ERROR_REPORTING))
        return;

    if(DISPLAY_ERRORS)
        printf('%s', $message);

    //Logging error on php file error log...
    if(LOG_ERRORS)
        error_log(strip_tags($message), 0);

}

ob_start();

@include 'content.php';

ob_end_flush();
?>