PHP Memcached get() Function

Last Updated : 06 Dec, 2021

The Memcached::get() function is an inbuilt function of memcached class in PHP which is used to get the value under a given key stored on memcache server.

Syntax:

public Memcached::get( $key, 
    callable $cache_cb = ?,  $$flags = ?): mixed

Parameters: This function accepts three parameters that are:

key: The key of the item to retrieve.
cache_cb: Read-through caching callback or null.
flags: Flags to control the returned result. When Memcached::GET_EXTENDED is given, the function will also return the CAS token.

Return Values: Returns the value stored in the cache or false otherwise. If the flags is set to Memcached::GET_EXTENDED, an array containing the value and the CAS token is returned instead of only the value. The Memcached::getResultCode() will return Memcached::RES_NOTFOUND if the key does not exist.

Below program illustrate the Memcached::set() 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 (Key-value already stored):

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.get.php

PHP Memcached::getServerList() Function

Shivam.Pradhan

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