What are some common methods for passing variables between PHP files?

One common method for passing variables between PHP files is to use sessions. By storing variables in the $_SESSION superglobal, you can access them across multiple PHP files within the same session. Another method is to use URL parameters to pass variables through the URL. This can be done by appending variables to the URL and then retrieving them using the $_GET superglobal in the receiving file. 

// Sending file
session_start();
$_SESSION['variable_name'] = $variable_value;

// Receiving file
session_start();
$variable_value = $_SESSION['variable_name'];
```

```php
// Sending file
$variable_value = 'example';
header("Location: receiving_file.php?variable_name=$variable_value");

// Receiving file
$variable_value = $_GET['variable_name'];

Keywords

include require $_GET $_POST sessions

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