index.php

<?php
    error_reporting(E_ALL);
    ini_set('display_errors', 1);
    
    header("Cache-Control: no-cache, must-revalidate");
    header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");
    
    header('Access-Control-Allow-Origin: *');
    header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
    header('Access-Control-Allow-Headers: content-type, page-size');
    
    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
        
        $headers = apache_request_headers();
        $pageSize = "A4";
        if(isset($headers["page-size"])) {
            $pageSize = $headers["page-size"];
        }
        
        $descriptorspec = array(
                                0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
                                1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
                                2 => array("file", "/dev/null", "w") // stderr is a file to write to
                                );
        
        $process = proc_open('/app/bin/fakesu -c wkhtmltopdf -L 25 -R 25 -T 25 -B 25 --page-size '.$pageSize.' --header-html /app/www/blank.html --header-spacing 5 --footer-html /app/www/blank.html --footer-spacing 5 --javascript-delay 2000 - -', $descriptorspec, $pipes);
        
        if (is_resource($process)) {
            $input = fopen('php://input', 'r');
            while (!feof($input)) {
                fwrite($pipes[0], fread($input, 8192));
            }
            
            fclose($pipes[0]);
            echo stream_get_contents($pipes[1]);
            fclose($pipes[1]);
            
            $return_value = proc_close($process);
            
        }
    }