PHP Memcached get()用法及代碼示例

Memcached::get() 函數是 PHP 中 memcached 類的內置函數，用於獲取存儲在 memcache 服務器上的給定鍵下的值。

用法:

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

參數:這個函數接受三個參數：

key:要檢索的項目的鍵。
cache_cb:Read-through 緩存回調或空。
flags:用於控製返回結果的標誌。當給定 Memcached::GET_EXTENDED 時，該函數還將返回 CAS 令牌。

返回值：返回存儲在緩存中的值，否則返回 false。如果標誌設置為 Memcached::GET_EXTENDED，則返回一個包含值和 CAS 令牌的數組，而不僅僅是返回值。如果鍵不存在，Memcached::getResultCode() 將返回 Memcached::RES_NOTFOUND。

以下示例程序旨在說明 PHP 中的 Memcached::set() 函數：

範例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);
  
?>

輸出：

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

示例 2(已存儲鍵值)：

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);
  
?>

輸出：

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

參考： https://www.php.net/manual/en/memcached.get.php

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注：本文由純淨天空篩選整理自Shivam.Pradhan大神的英文原創作品 PHP Memcached get() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。