(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 1.2.0)
Phar::isValidPharFilename — Returns whether the given filename is a valid phar filename
final public static Phar::isValidPharFilename ( string $filename [, bool $executable = true ] ) : bool
Returns whether the given filename is a valid phar filename that will be recognized as a phar archive by the phar extension. This can be used to test a name without having to instantiate a phar archive and catch the inevitable Exception that will be thrown if an invalid name is specified.
filename
The name or full path to a phar archive not yet created
executable
This parameter determines whether the filename should be treated as a phar executable archive, or a data non-executable archive
Returns true if the filename is valid, false if not.
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https://www.php.net/manual/en/phar.isvalidpharfilename.php