system/system/HEADER.php

<?php
namespace SYSTEM;

class HEADER {
    
    private static function checkHeader(){
        $file = null;
        $line = null;
        if(headers_sent($file, $line)){
            new \SYSTEM\LOG\WARNING('Header already sent @ '.$file.' line '.$line);
            return false;}
        return true;
    }
    
    public static function JSON(){
        if(self::checkHeader()){
            header('Access-Control-Allow-Origin: *');//allow cross domain calls
            header('content-type: application/json');}
    }
    public static function PNG(){
        if(self::checkHeader()){
            header('content-type:image/png;');}
    }
}