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phpfunctionvariableslanguage-design

What does a PHP function return by default?

If I return nothing explicitly, what does a php function exactly return?

function foo() {}

  1. What type is it?

  2. What value is it?

  3. How do I test for it exactly with === ?

  4. Did this change from php4 to php5?

  5. Is there a difference between function foo() {} and function foo() { return; }

(I am not asking how to test it like if (foo() !=0) ...)

Solution
    1. null
    2. null
    3. if(foo() === null)
    4. -
    5. Nope.

    You can try it out by doing:

    $x = foo();
var_dump($x);