Question: Is there a way to create/define a variable available to all php files(like superglobals)

> 
> Example:
> 
> 
> i define a variable in **file1.php** `$car = ferrari`
> 
> 
> then in **file2.php** i write `echo $car;`
> 
> 
> then it will output `ferrari`
> 
> 
> 

how can i define a variable in file1.php and access it in file2.php

**EDIT:**

The answers is good, but do is there another alternative?because i will have multiple php files in multiple directories, do i have to create its own php file for each directory?if thats the only way, then i'll do it.

Answer: 
* create init.php in your project's root directory.

If you need constant variable (so, you can't edit it)
- create constants.php in your project's root dir.

If you need editable variable
- create globals.php in your project's root dir.

**constants.php**

```
<?php
define('CAR', 'ferrari');

```

**globals.php**

```
<?php

class Globals
{
  public static $car = 'ferrari';
}

```

include **constants.php** and **globals.php** to **init.php**.

```
<?php
require_once(dirname(__FILE__).DIRECTORY_SEPARATOR.'constants.php');
require_once(dirname(__FILE__).DIRECTORY_SEPARATOR.'globals.php');

```

include **init.php** to php sources.

```
<?php
require_once(dirname(__FILE__).DIRECTORY_SEPARATOR.'init.php');

```

If you need variable for long use, not only one pageload, then use session. (user logins, settings, ...)

```
<?php
$_SESSION['car'] = 'ferrari';

```

In your php sources, you can use constant and global variables:

Example:

```
<?php
echo CAR; //ferrari

echo Globals::$car; //ferrari

Globals::$car = 'renault'; //set your global variable

echo Globals::$car; //renault

```

**Refs:**

> 
> <http://php.net/manual/en/language.oop5.static.php>
> 
> 
> <http://php.net/manual/en/function.define.php>
> 
> 
> <http://php.net/manual/en/function.dirname.php>
> 
> 
> <http://php.net/manual/en/reserved.variables.session.php>
> 
> 
>
You can use `SESSION` or `include` concept.

1) By using `SESSION`

**file1.php**

```
session_start();
$_SESSION['car'] = 'ferrari';

```

**file2.php**

```
session_start();
echo $_SESSION['car'];  //Result: ferrari

```

2) By using `include`

**file2.php**

```
include 'file1.php';
echo $car //Result: ferrari

```