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PHP Memcached add() Function

  • Last Updated : 06 Dec, 2021

The Memcached::add() function is an inbuilt function of memcached class in PHP which is used to set/add a given value under a given value with an expiration time(TTL) on memcache server. This function is similar to Memcached::set() function, but the operation fails if the key already exists on the server.

Syntax:

public Memcached::add( $key,  $value,  $expiration = ?): bool

Parameters: This  function accepts three parameters that are:

  • key: The key under which to store the value.
  • value: The value to store.
  • expiration: The expiration time, defaults to 0. See Expiration Times for more info.

Return Values: This function returns true in case key-value pair stored successfully and false in case of any failure. The Memcached::getResultCode() function will return Memcached::RES_NOTSTORED if the key already exists.

Below examples illustrate the Memcached::add() function in PHP:

Example 1:

PHP




<?php
    
echo "<pre>";
  
// Server & port details
$server = '127.0.0.1';
$port = 11211;
  
// Initiate a new object of memcache
$memcacheD = new Memcached();
  
// Add server
if ($memcacheD->addServer($server, $port)) {
    echo "**  server added ** \n";
}
else {
    echo "** issue while creating a server **\n";
}
  
// Set key & value with TTL
$key = "GEEKSFORGEEKS";
$value = "computer science portal";
$ttl = 3600;
  
if ($memcacheD->add($key, $value, $ttl)) 
      echo "** added key-value (" . $key . ":" 
      . $value . ")to cache successfully!! **\n";
else 
      echo "** error while adding value to cache!! **\n";
  
// Get value of key
echo "****   FETCHED VALUE   FOR KEY :"
      . $key . " ****\n";
  
$valD = $memcacheD->get($key);
var_dump($valD);
  
?>

Output:

** server added **
** added key-value (GEEKSFORGEEKS:computer science portal)to cache successfully!! **
****   FETCHED VALUE   FOR KEY :GEEKSFORGEEKS ****
string(23) “computer science portal”

Example 2 (already existing key-pair):

PHP




<?php
    
echo "<pre>";
  
// Server & port details
$server = '127.0.0.1';
$port = 11211;
  
// Initiate a new object of memcache
$memcacheD = new Memcached();
  
// Add server
if ($memcacheD->addServer($server, $port)) {
    echo "**  server added ** \n";
}
else {
    echo "** issue while creating a server **\n";
}
  
// Set key & value with TTL
$key = "GEEKSFORGEEKS";
$value = "computer science portal";
$ttl = 3600;
  
if ($memcacheD->add($key, $value, $ttl))
      echo "** added key-value (" . $key . ":"
      . $value . ")to cache successfully!! **\n";
else 
      echo "** error while adding value to cache!! **\n";
  
// Get value of key
echo "****   FETCHED VALUE   FOR KEY :" 
      . $key . " ****\n";
  
$valD = $memcacheD->get($key);
var_dump($valD);
  
?>

Output:

**  server added **
** error while adding value to cache!! :: MSG:: NOT STORED **
****   FETCHED VALUE   FOR KEY :geeksforgeeks ****
string(23) “computer science portal”

Reference: https://www.php.net/manual/en/memcached.add.php


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