How can HTTP addresses affect the functionality of PHP functions like filemtime()?

HTTP addresses can affect the functionality of PHP functions like filemtime() because they do not represent local files on the server. To solve this issue, you can use file_get_contents() to retrieve the file contents from the HTTP address and then use filemtime() on a temporary file created with the retrieved contents. 

$url = 'http://example.com/file.txt';
$tempFile = tempnam(sys_get_temp_dir(), 'tempfile');
file_put_contents($tempFile, file_get_contents($url));

$lastModified = filemtime($tempFile);

unlink($tempFile);

Keywords

HTTP addresses filemtime() PHP functions functionality affect

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