what is Singleton in PHP

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@CodeGrepperManu answered on April 9, 2023 Popularity 9/10 Helpfulness 4/10

answer what is Singleton in PHP

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what is Singleton in PHP

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What is Singleton? explain with PHP example

In SIngleton design pattern

Only a single object will be created and i.e available all across the application.

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.

// General singleton class.
class Singleton {
  // Hold the class instance.
  private static $instance = null;
  
  // The constructor is private
  // to prevent initiation with outer code.
  private function __construct()
  {
    // The expensive process (e.g.,db connection) goes here.
  }
 
  // The object is created from within the class itself
  // only if the class has no instance.
  public static function getInstance()
  {
    if (self::$instance == null)
    {
      self::$instance = new Singleton();
    }
 
    return self::$instance;
  }
}
// sesond 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(); //will not work if we try to initiate object again.
?>

Popularity 9/10 Helpfulness 4/10 Language php

Source: Grepper

Tags: php singleton

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Contributed on Apr 09 2023

@CodeGrepperManu

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<?php
/*singleton design pattern should have
private static variable
private constructor method
public static method return class single instance */

class clsSingleTon
{
  private static $conn=null;
  private function __construct()
  {
    print "Instance Created \n";
  }
  public static function setConn()
  {
    if(self::$conn == null)
    {
      self::$conn = new static();
    }else{
      print "Instance Already Created \n";
    }
    return self::$conn;
  }
}
$obj = clsSingleTon::setConn();
//$obj = clsSingleTon::setConn(); 
//if we create second Instance then it will say already created 
?>

Popularity 9/10 Helpfulness 1/10 Language php

Source: onecompiler.com

Tags: singleton php ph

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Contributed on Jun 01 2023

@CodeGrepperManu

0 Answers Avg Quality 2/10

what is Singleton in PHP

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