check.php

<?php
/**
*
* @package stckr framework (based on phpBB)
* @version $Id: check.php
* @copyright (c) 2018 Kenny Cameron
* Developed using the phpBB template engine
*
*/

// Include all the relevant files we need
$root_path = (defined('ROOT_PATH')) ? ROOT_PATH : './';
require_once($root_path . 'inc/start.php');

$Convrtr	= new Convrtr();
$template 	= new Template(); // Needs to be done on every page we are setting up
$template->set_custom_template($root_path . 'theme/html', 'default');  // This is important as it states where the template files are located
include_once($root_path . 'inc/language.php');

$page 		= "{$root_path}check.php";
$mode 		= (isset($_GET['m'])) ? (string) $_GET['m'] : '';
$check		= (isset($_POST['check'])) ? true : false;

$section	= 'Check Files';

foreach ($_SESSION as $key => $value) {
	$_SESSION[$key] = stripslashes($value);
}

$errors		= array(); // Set up an array to catch errors

/**
 * Handling this error outside _POST due to:
 * "If the size of post data is greater than post_max_size, the $_POST and $_FILES superglobals are empty."
 * http://stackoverflow.com/a/3543239 / http://stackoverflow.com/a/11745361
 *
 * No apparent way to handle this inside $check =/
 */
if($_SERVER['REQUEST_METHOD'] == 'POST' && empty($_POST) && empty($_FILES) && $_SERVER['CONTENT_LENGTH'] > 0) {
	$c = 0; $errors[] = $Convrtr->uploadError(UPLOAD_ERR_INI_SIZE);
	foreach($errors as $error) {
		$errors[$c]['message_text'] = $error;
		$template->assign_block_vars('errors', array(
			'ERROR_TXT' => $error,
		));
		$c++;
	}
}

if($check) {

	if ($_FILES["tmpFile"]["error"] != 0) {
		$errors[] = $Convrtr->uploadError($_FILES["tmpFile"]["error"]);
	}

	if(!sizeof($errors)) {
		$tmpF = fopen($_FILES["tmpFile"]["tmp_name"], "rb");
		$data = fread($tmpF, 16); // grabbing the 1st 16 bytes
		fclose($tmpF);

		$file_hex	   = $Convrtr->strToHex($data);
		$file_header	= $Convrtr->identifyHeader($file_hex);

		$mesg = "File upload was successful<br /><br />";
		$mesg .= "File header (first 16 bytes): " . $file_hex . "<br />";
		$mesg .= "Your file was identified as '" . $file_header . "'";
		$template->assign_vars(array(
			'MSG_HEADER' => $mesg,
		));
		unset($_FILES);
	}
	else {
		$count = 0;
		// Loop through all our error messages and add them into a block
		// This block can then be passed to the template and styled
		// More information available here - http://wiki.phpbb.com/Tutorial.Template_syntax#Blocks
		foreach($errors as $error) {
			$errors[$count]['message_text'] = $error;
			$template->assign_block_vars('errors', array(
				'ERROR_TXT' => $error,
			));
			$count++;
		}
	}
}

page_header($section);

$template->assign_vars(array(
	'ROOT_PATH'		=> $root_path,
	'S_FILE_ERROR'	=> (isset($errors) && sizeof($errors)) ? true : false,
	'S_MESSAGE'		=> (isset($mesg)) ? $mesg : '',
));

// Set up the html file for the page
$template->set_filenames(array(
	'body' => 'check_body.html',
));

// Assign the html file to the display
$template->display('body');