Useless Function Calls¶

This pass detects calls to functions or methods whose return value is not used and which have no side-effects.

For example, considering code such as:

class MyClass
{
    private $x;

    public function getX()
    {
        return $this->x;
    }
}

$myClass = new MyClass();
$myClass->getX(); // Would be flagged as it can simply be removed.
$x = $myClass->getX(); // This is fine as the return value is used.