PHP - 在CLI中使用$ _SERVER来获取执行开始时间是否安全？

Question

I do not wish to rely on a time() call made to a start of the script. Instead, i find $_SERVER['REQUEST_TIME'] more favourable. I tried that on CLI and it works.

Since I read docs which say information in the $_SERVER array is not guaranteed, and the array being named as $_SERVER, i was wondering if it safe to use $_SERVER on the CLI. The doc for $_SERVER on php.net says it is "Server and execution environment information". Will $_SERVER['REQUEST_TIME'] always be available?

Answer 1

It is possible (although rare) for REQUEST_TIME to not be set, as can be seen here.

I'd recommend falling back to time() if it's not set. eg.

$time = $_SERVER['REQUEST_TIME'];

if(!$time) {
    $time = time();
}