(PHP 5 >= 5.1.2, PHP 7)
SplFileInfo::getMTime — Gets the last modified time
public SplFileInfo::getMTime ( ) : int
Returns the time when the contents of the file were changed. The time returned is a Unix timestamp.
This function has no parameters.
Returns the last modified time for the file, in a Unix timestamp.
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https://www.php.net/manual/en/splfileinfo.getmtime.php