The __wakeup Method

The __wakeup method is a magic method in PHP, which is automatically called during object deserialization. It allows restoring the object's resources or performing additional actions after deserialization.

Syntax

public function __wakeup(): void
{
	// code
}

Example

An example of a class with the __wakeup method that restores the database connection:

<?php
	class DatabaseConnection
	{
		private $connection;
		
		public function __construct()
		{
			$this->connect();
		}
		
		private function connect()
		{
			$this->connection = 'db_connected';
		}
		
		public function __sleep()
		{
			return [];
		}
		
		public function __wakeup()
		{
			$this->connect();
		}
	}
	
	$db = new DatabaseConnection();
	$serialized = serialize($db);
	$unserialized = unserialize($serialized);
?>

Example

An example of restoring temporary files after deserialization:

<?php
	class TempFileHandler
	{
		private $tempFiles = [];
		
		public function addTempFile($file)
		{
			$this->tempFiles[] = $file;
		}
		
		public function __wakeup()
		{
			foreach ($this->tempFiles as $file) {
				if (file_exists($file)) {
					unlink($file);
				}
			}
			$this->tempFiles = [];
		}
	}
	
	$handler = new TempFileHandler();
	$handler->addTempFile('temp1.txt');
	$serialized = serialize($handler);
	$unserialized = unserialize($serialized);
?>

The __wakeup Method

Syntax

Example

Example

See Also