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Home php教程 php手冊 php的time()與$_SERVER[REQUEST_TIME]區(qū)別是什么

php的time()與$_SERVER[REQUEST_TIME]區(qū)別是什么

Jul 13, 2017 pm 05:03 PM
php

關(guān)于php中time()與$_SERVER['REQUEST_TIME']用法的區(qū)別在哪里,相信有很多人會像我一樣會質(zhì)疑到兩者之前的主要區(qū)別在哪里,下面我就為大家分析一下:

1. time() 獲取當(dāng)前的系統(tǒng)時間戳

int time(void) :

返回當(dāng)前的 Unix 時間戳 (返回自從 Unix 紀(jì)元(格林威治時間 1970 年 1 月 1 日 00:00:00)到當(dāng)前時間的秒數(shù))。

自 PHP 5.1 起在 $_SERVER['REQUEST_TIME'] 中保存了發(fā)起該請求時刻的時間戳。

$_SERVER["REQUEST_TIME"] :The timestamp of the start of the request. Available since PHP 5.1.0。PS:這里相信英文比較好的朋友一看解釋就都明白了。

2. $_SERVER["REQUEST_TIME"] 得到請求開始時的時間戳。

簡單的說time()與$_SERVER["REQUEST_TIME"]都是獲得當(dāng)前的時間戳,但time()返回當(dāng)前的Unix時間戳而$_SERVER["REQUEST_TIME"]獲取的是得到請求php腳本開始時的時間戳,時間上稍微會一點差別。一般的用法當(dāng)中差別不會很大。不過當(dāng)php的執(zhí)行程序過多,過于復(fù)雜的時候,這兩者之間的差別就會變大,舉個例子說明一下吧:

實例代碼:

<?php    
date_default_timezone_set(&#39;PRC&#39;); //設(shè)置時區(qū)為中國的    
sleep(5);//php腳本睡眠5秒    
echo date(&#39;Y-m-d H:i:s&#39;,time());//獲取當(dāng)前系統(tǒng)時間的時間戳
echo &#39;<hr/>&#39;; 
echo date(&#39;Y-m-d H:i:s&#39;,$_SERVER[&#39;REQUEST_TIME&#39;]);//得到請求此php腳本時的時間戳
?>

輸出結(jié)果截圖如下:


2014111985240496.jpg

稍加總結(jié)一下:

因為sleep(5)睡了5秒,之后用time()獲取系統(tǒng)的時間戳,$_SERVER['REQUEST_TIME']則記錄了發(fā)起此請求時刻的時間戳。

所以兩都之間的差別就在$_SERVER['REQUEST_TIME']比用time()獲取的時間戳早的這5秒當(dāng)中;

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