switch uses the == operator 

so bogus

$var = 0;

switch (true)
{
	case $var === "abc":
		echo "abc";
		break;
	case $var === "zxc":
		echo "zxc";
		break;
	default:
		echo "def";
		break;
}

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Switch does a typeless comparison this is needed so code like

const A = 1;
const B = 2;
switch ($_GET['option']) {
case A: ...
Case B: ...
}

works. We are aware of the "strange" aspects of it ...