Description:
------------
According the documentation the method Phar::__construct( http://php.net/manual/en/phar.construct.php ) has only 3 parameters but by using reflection we can see there is a 4th parameter ("fileformat").

Test script:
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<?php

$rm = new ReflectionMethod(Phar::class, "__construct");

foreach ($rm->getParameters() as $param) {
    printf("param #%d: %s%s\n", $param->getPosition(), $param->getName(), $param->isOptional() ? " (Opt.)" : "");
}

Actual result:
--------------
param #0: filename
param #1: flags (Opt.)
param #2: alias (Opt.)
param #3: fileformat (Opt.)