SIMPLE JSON FLAT FILE DATABASE

db.php

<?php 

    if ($_GET['id']) push_out( read_record($_GET['id']));

    if ($_POST){
        if (is_numeric($_POST['id'])){
            //update record
            
            push_out(json_encode(save_record($_POST)));
        }elseif(is_numeric($_POST['_delete_record'])){  
            //remove record    
            
            push_out(json_encode(remove_record($_POST['_delete_record'])));
        }elseif(!$_POST['id']){
            //add record
            
            push_out(json_encode(save_record($_POST)));
        }
    }
    
    function push_out($data){
        die($data);
    }
    
    function data_path($id){
        //path to file
        return "./_data_record_{$id}";
    }
    
    function save_record($data){
        if (!is_numeric($data['id'])) $data['id'] = new_id();
        file_put_contents(data_path($post['id']),json_encode($data));
        return $data['id'];
    }
    
    function remove_record($id){
        if (unlink(data_path($id))) return $id;
    }
    
    function read_record($id){
        return file_get_contents(data_path($id));
    }

    function new_id(){
        return round(time()*rand());    
    }
?>