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Link: http://codepad.org/EP9sToyO    [ raw code | output | fork ]

PHP, pasted on Oct 28:
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<?php

function bool_str($b)
{
    return ($b ? "true" : "false");
}

function foo($first, &$second = null)
{
    echo bool_str(isset($first)) . " " . bool_str(isset($second)) . " " .
         bool_str(is_null($first)) . " " . bool_str(is_null($second)) . "\n";
}

$a = 1;
$b = 2;

foo($a, $b);
foo($a);

?>


Output:
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2
true true false false
true false false true


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