How to get the last modified time in php

How to get the last modification time: 1. Use the filemtime() function to get the last modification time of the specified file. The syntax "filemtime($filename)" will return the last modification time of the file content in the form of a Unix timestamp. ; 2. Use the getlastmod() function to obtain the last modification time of the current file. The syntax "getlastmod()" will also return the last modification time in the form of a Unix timestamp.

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

Method 1: Use filemtime( ) function gets the last modification time of the specified file

filemtime() function returns the last modification time of the file content.

filemtime($filename)

• $filename : Required. Specifies the documents to be checked.

Return value:

• If successful, this function will return the last modification time of the file content in the form of a Unix timestamp. On failure, returns FALSE.

Note: The result of this function will be cached. Please use clearstatcache() to clear the cache.

Example: There is a text file named "test.txt" below, and its last modification time is as follows:

<?php
header("Content-type:text/html;charset=utf-8");
$file = "test.txt";
echo "文件修改时间为：".filemtime($file);
?>

Extended knowledge: Functions to obtain creation time and last access time

• filectime($filename ): Returns the creation time of the file

• fileatime($filename): Returns the last access time of the file

Method 2: Use the getlastmod() function to get the last modification time of the current file

getlastmod()

• Returns the last modification time of the current page. This value is a Unix timestamp that can be formatted for output using the date() function; false is returned on error.

Example: Get the last modified time of the current page file

##

<?php
$time = getlastmod();
echo date(&#39;Y-m-d H:i:s&#39;,$time);
?>

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