PHP "riddle"

[ZiNgA BuRgA]

I'm clearly bored writing this post.
Take this PHP function:

PHP Code:

function test_equality($a, $b, $c) { var_dump($a==$b, $a==$c, $b==$c); }

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A certain set of inputs ($a, $b and $c) will cause the function to produce the following output:

Code:

bool(true) bool(true) bool(false)

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Provide one such sample input to the function.