PHP Memcached get() Function
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
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
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