# PHP Custom Session Handler

This script was made for a client that had problems with PHP sessions in WordPress.
This Session class can replace PHP sessions in almost all ways, except for embedding complex objects in this session, but any class that can serialize with PHP's native serialize function will work.

# The `Session Class` defined in `Session.php`

The session files are written to the wp_content/session folder, wp_content because it is already writeable in most cases.

// Session.php
<?php
class Session implements ArrayAccess {
    private $container = [];
    private $filePath;
    private $fileName;

    public function __construct() {
        $this->init();
        if (file_exists($this->fileName)) {
            $obj = unserialize(file_get_contents($this->fileName));
            $this->setContainer($obj->getContainer());
        }
    }

    public function setContainer($values) {
        $this->container = $values;
    }

    public function getContainer() {
        return $this->container;
    }

    private function init() {
        $this->filePath = WP_CONTENT_DIR.'/sessions';
        $this->fileName = $this->filePath.'/'.session_id();
        if(is_dir($this->filePath) === false){
            mkdir($dir);
        }
    }

    public function offsetSet($offset, $value) {
        if (is_null($offset)) {
            $this->container[] = $value;
        } else {
            if (strpos($offset,'.') === false) {
                $this->container[$offset] = $value;
            } else {
                $exp = explode('.',$offset);
                if (count($exp) == 3) {
                    $this->container[$exp[0]][$exp[1]][$exp[2]] = $value;
                } elseif(count($exp) == 2) {
                    $this->container[$exp[0]][$exp[1]] = $value;
                }
            }            
        }
    }

    public function offsetExists($offset) {
        if (strpos($offset,'.') === false) {
            return isset($this->container[$offset]);
        } else {
            $exp = explode('.',$offset);
            if (count($exp) == 3) {
                return isset($this->container[$exp[0]][$exp[1]][$exp[2]]);
            } elseif(count($exp) == 2) {
                return isset($this->container[$exp[0]][$exp[1]]);
            }
        }   
    }

    public function offsetUnset($offset) {
        if (strpos($offset,'.') === false) {
            unset($this->container[$offset]);
        } else {
            $exp = explode('.',$offset);
            if (count($exp) == 3) {
                unset($this->container[$exp[0]][$exp[1]][$exp[2]]);
            } elseif(count($exp) == 2) {
                unset($this->container[$exp[0]][$exp[1]]);
            }
        }   
    }

    public function offsetGet($offset) {
        if (strpos($offset,'.') === false) {
            return isset($this->container[$offset]) ? $this->container[$offset] : null;
        } else {
            $exp = explode('.',$offset);
            if (count($exp) == 3) {
                return isset($this->container[$exp[0]][$exp[1]][$exp[2]]) ? $this->container[$exp[0]][$exp[1]][$exp[2]] : null;
            } elseif(count($exp) == 2) {
                return isset($this->container[$exp[0]][$exp[1]]) ? $this->container[$exp[0]][$exp[1]] : null;
            }
        }  
        
    }

    function deleteOldFiles() {
        $files = glob($this->filePath."*");
        $now   = time();

        foreach ($files as $file) {
            if (is_file($file)) {
                if ($now - filemtime($file) >= 60 * 60 * 24) { // 1 days
                    unlink($file);
                }
            }
        }
    }

    function __destruct() {
        $this->deleteOldFiles();
        file_put_contents($this->fileName,serialize($this));
    }
}

# Usage

// Instantiate session
$session = new Session();

//Set $session object like it is an array
$session['key'] = $value 

// Set nested array variable, usually it would look like this:
$_SESSION['key']['nest'] = $value;

// But now just dot separate the nesting 3 levels deep max
// Two levels: 
$session['key.nest'] = $value;

// Three levels: Use to look like
$_SESSION['key']['nest']['deeper'] = $value;

// Now it looks like
$session['key.nest.deeper'] = value;

# PHP Custom Session Handler

# The Session Class defined in Session.php

# Usage

# The `Session Class` defined in `Session.php`