How can PHP be used to check if a file has been updated or modified on the server?

To check if a file has been updated or modified on the server using PHP, you can compare the file's last modification time with a previously stored timestamp. If the last modification time is newer than the stored timestamp, then the file has been updated. 

$filename = 'example.txt';
$storedTimestamp = filemtime($filename); // Get the last modification time of the file

// Check if the file has been updated
if (filemtime($filename) > $storedTimestamp) {
    echo 'File has been updated!';
} else {
    echo 'File has not been updated.';
}

Keywords

PHP file modification time filemtime() server file handling

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