Online PHP editor | output for QiJkC

@ 2013-12-04T15:52:55Z

<?php

function getGrandParentClass($object, $level = NULL)
{
    $gp = $object = get_class($object);
    $isNull = is_null($level);
    $j = 0;
   
    while(get_parent_class($gp) && ($isNull || $level > $j))
    {        
        $gp = get_parent_class($gp);
        $j++;
       
        if(!get_parent_class($gp) && !$isNull && $level > $j)
        return false;
    }
   
    return $gp == $object ? false : $gp;
}

    class A {}
    class B extends A {}
    class C extends B {}
    class D extends C {}
     
     
    var_dump(getGrandParentClass(new A())); // false
    var_dump(getGrandParentClass(new D(), NaN));

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: bool(false) Fatal error: Uncaught Error: Undefined constant "NaN" in /in/QiJkC:28 Stack trace: #0 {main} thrown in /in/QiJkC on line 28
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33: bool(false) Warning: Use of undefined constant NaN - assumed 'NaN' (this will throw an Error in a future version of PHP) in /in/QiJkC on line 28 bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20: bool(false) Notice: Use of undefined constant NaN - assumed 'NaN' in /in/QiJkC on line 28 bool(false)

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