What potential errors or warnings should be considered when using the filemtime() function in PHP?

When using the filemtime() function in PHP to get the last modification time of a file, one potential issue to consider is that the function may return false if it fails to retrieve the modification time. This can happen if the file does not exist or if the user running the script does not have the necessary permissions to access the file. To handle this potential error, you can check if the filemtime() function returns false and handle it accordingly in your code. 

$file = 'example.txt';

$modification_time = filemtime($file);

if($modification_time === false){
    echo "Error: Unable to retrieve modification time of file.";
} else {
    echo "Last modification time of file: " . date("Y-m-d H:i:s", $modification_time);
}

Keywords

filemtime PHP errors warnings timestamp file handling

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