(PHP 4, PHP 5, PHP 7)
filemtime — Gets file modification time
filemtime ( string $filename ) : int|false
This function returns the time when the data blocks of a file were being written to, that is, the time when the content of the file was changed.
filename
Path to the file.
Returns the time the file was last modified, or false on failure. The time is returned as a Unix timestamp, which is suitable for the date() function.
Example #1 filemtime() example
<?php
// outputs e.g. somefile.txt was last modified: December 29 2002 22:16:23.
$filename = 'somefile.txt';
if (file_exists($filename)) {
echo "$filename was last modified: " . date ("F d Y H:i:s.", filemtime($filename));
}
?> Upon failure, an E_WARNING is emitted.
Note:
Note that time resolution may differ from one file system to another.
Note: The results of this function are cached. See clearstatcache() for more details.
As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to Supported Protocols and Wrappers to determine which wrappers support stat() family of functionality.
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https://www.php.net/manual/en/function.filemtime.php