The filemtime Function
The filemtime function returns the Unix timestamp of the last modification time of a file. The file path is passed as a parameter. If the file does not exist, the function returns false.
Syntax
filemtime(string $filename): int|false
Example
Get the modification time of the current file:
<?php
$res = filemtime(__FILE__);
echo $res;
?>
Code execution result:
1672531200
Example
Check if the file exists and output the modification date:
<?php
$file = 'test.txt';
if (file_exists($file)) {
echo 'Last modified: ' . date('Y-m-d H:i:s', filemtime($file));
} else {
echo 'File not found';
}
?>
Code execution result:
'Last modified: 2023-01-01 12:00:00'
Example
Compare the modification time of two files:
<?php
$file1 = 'file1.txt';
$file2 = 'file2.txt';
if (filemtime($file1) > filemtime($file2)) {
echo 'File1 is newer';
} else {
echo 'File2 is newer or equal';
}
?>
Code execution result:
'File1 is newer'
