PHP | filemtime( ) Function (original) (raw)
Last Updated : 03 May, 2018
The filemtime() function in PHP is an inbuilt function which is used to return the last time of a specified file when its content was modified. The filemtime() function returns the last time the file was changed as a Unix Timestamp on success and False on failure.
The filename is passed as a parameter to the filemtime() function. The result of the filemtime() function is cached and a function called clearstatcache() is used to clear the cache.
Syntax:
filemtime($filename)
Parameters: The filemtime() function in PHP accepts only one parameter $filename. It specifies the file which you want to check.
Return Value: It returns the last time of a file when its content was modified as a Unix Timestamp on success and False on failure.
Errors And Exception:
- The time resolution may differ from one file system to another.
- This function doesn’t works on some unix systems which have access time updates are disabled to increase performance.
Examples:
Input : echo filemtime("gfg.txt"); Output : 1525159574
Input : echo "Last modified: ".date("F d Y H:i:s.", filemtime("gfg.txt")); Output : Last modified: May 1 2018 07:26:14.
Below programs illustrate the filemtime() function.
Program 1:
<?php
echo filemtime ( "gfg.txt" );
?>
Output:
1525159574
Program 2:
<?php
echo filemtime ( "gfg.txt" );
echo "Last modified: " . date ( "F d Y H:i:s." ,
`` filemtime ( "gfg.txt" ));
?>
Output:
1525159574 Last modified: May 1 2018 07:26:14.