FileSessionHandler.php

<?php
namespace Rakit\Session;

use SessionHandlerInterface;
use Exception;

class FileSessionHandler implements SessionHandlerInterface {
    
    protected $sess_path;
    
    protected $prefix;
    
    protected $postfix;
    
    public function __construct($sess_path, $prefix = 'sess_', $postfix = '') {
        if (!is_dir($sess_path)) {
            throw new Exception("Cannot use FileSessionHandler, directory '{$sess_path}' not found", 1);
        }
        
        if (!is_writable($sess_path)) {
            throw new Exception("Cannot use FileSessionHandler, directory '{$sess_path}' is not writable", 2);
        }
        
        $this->sess_path = $sess_path;
        $this->prefix = $prefix;
        $this->postfix = $postfix;
    }
    
    public function open($save_path, $sess_name) {
        return true;
    }
    
    public function close() {
        return true;
    }
    
    public function read($sess_id) {
        return (string)@file_get_contents("{$this->sess_path}/{$this->prefix}{$sess_id}{$this->postfix}");
    }
    
    public function write($sess_id, $data) {
        return file_put_contents("{$this->sess_path}/{$this->prefix}{$sess_id}{$this->postfix}", $data) === false ? false : true;
    }
    
    public function destroy($sess_id) {
        $file = "{$this->sess_path}/{$this->prefix}{$sess_id}{$this->postfix}";
        
        if (file_exists($file)) {
            unlink($file);
        }
        
        return true;
    }
    
    public function gc($lifetime) {
        foreach (glob("{$this->sess_path}/{$this->prefix}*") as $file) {
            if (filemtime($file) + $lifetime < time() && file_exists($file)) {
                unlink($file);
            }
        }
        
        return true;
    }
}