What PHP function can be used to determine the last modification time of a file?

To determine the last modification time of a file in PHP, you can use the `filemtime()` function. This function returns the Unix timestamp of when the file was last modified. You can use this timestamp to format the date and time according to your needs. 

$filename = 'example.txt';
$lastModifiedTime = filemtime($filename);
echo "Last modified time of $filename: " . date("Y-m-d H:i:s", $lastModifiedTime);

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PHP function last modification time file determine

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