How to get the last modification time of a file in PHP?

#How to get the last modification time of a file in PHP?

In PHP, you can easily obtain the last modification time of a file through the system's own function "filemtime()". Its function is to return the time when the file was last modified. An error occurs. Returns FALSE.

<?php
$a=filemtime("log.txt");
echo "修改时间：".date("Y-m-d H:i:s",$a)."
?>

Knowledge Extension

filemtime ( string filename )

Returns the time when the file was last modified, and returns FALSE on error. The time is returned as a Unix timestamp, usable with date().

For example:

$a=filemtime("log.txt");
echo "修改时间：".date("Y-m-d H:i:s",$a)."

---------------------------------- -----------------------------------------------

filectime ( string filename )

Returns the time when the file's last inode was modified, or FALSE if an error occurs. The time is returned as a Unix timestamp.

For example:

$a=filectime("log.txt");
          echo "创建时间：".date("Y-m-d H:i:s",$a)."

---------------------------------- -----------------------------------------------

fileatime ( string filename )

Returns the time when the file was last accessed, or FALSE if an error occurred. The time is returned as a Unix timestamp.

For example:

$a=fileatime("log.txt");
echo "修改时间：".date("Y-m-d H:i:s",$a)."

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