In php, time and $ _ SERVER ["REQUEST_TIME"]

: This article mainly introduces time and $ _ SERVER [REQUEST_TIME] in php. For more information about PHP tutorials, see. Time-returns the current Unix timestamp, and returns the number of seconds from the Unix epoch (GMT 00:00:00, January 1, January 1, 1970) to the current time. Will call the function, slow.

$ _ SERVER ["REQUEST_TIME"]-the timestamp at the request start. Valid from PHP 5.1.0. No need to call functions, which is more efficient (recommended)

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