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What is singleton design concept in PHP?
Singleton Pattern ensures that a class has only one instance and provides a global point to access it. It ensures that only one object is available all across the application in a controlled state. Singleton pattern provides a way to access its only object which can be accessed directly without the need to instantiate the object of the class.
Example
<?php
class database {
public static $connection;
private function __construct(){
echo "connection created";
}
public function connect(){
if(!isset(self::$connection)){
self::$connection = new database();
}
return self::$connection;
}
}
$db = database::connect();
$db2 = database::connect();
?>Output
connection created
Explanation
In the above example as we are following a singleton pattern so the object $db2 can't be created. Only a single object will be created and i.e available all across the application.
Updated on: 29-Jun-2020
3K+ Views
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