Testing variable assignments within if statements in PHP

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<?php

function return_false()
{
	return false;
}

function return_true()
{
	return true;
}

function return_null()
{
	return null;
}

function return_emptystring()
{
	return "";
}

function return_string()
{
	return "ohai";
}

function return_zero()
{
	return 0;
}

function return_one()
{
	return 1;
}

function return_emptyarray()
{
	return array();
}

function return_array()
{
	return array(1);
}


if($var = return_false())
{
	echo("Testcase 1 (boolean false) results in TRUE\r\n");
}
else
{
	echo("Testcase 1 (boolean false) results in FALSE\r\n");
}

if($var = return_true())
{
	echo("Testcase 2 (boolean true) results in TRUE\r\n");
}
else
{
	echo("Testcase 2 (boolean true) results in FALSE\r\n");
}

if($var = return_null())
{
	echo("Testcase 3 (null) results in TRUE\r\n");
}
else
{
	echo("Testcase 3 (null) results in FALSE\r\n");
}

if($var = return_emptystring())
{
	echo("Testcase 4 (empty string) results in TRUE\r\n");
}
else
{
	echo("Testcase 4 (empty string) results in FALSE\r\n");
}

if($var = return_string())
{
	echo("Testcase 5 (filled string) results in TRUE\r\n");
}
else
{
	echo("Testcase 5 (filled string) results in FALSE\r\n");
}

if($var = return_zero())
{
	echo("Testcase 6 (integer 0) results in TRUE\r\n");
}
else
{
	echo("Testcase 6 (integer 0) results in FALSE\r\n");
}

if($var = return_one())
{
	echo("Testcase 7 (integer 1) results in TRUE\r\n");
}
else
{
	echo("Testcase 7 (integer 1) results in FALSE\r\n");
}

if($var = return_emptyarray())
{
	echo("Testcase 8 (empty array) results in TRUE\r\n");
}
else
{
	echo("Testcase 8 (empty array) results in FALSE\r\n");
}

if($var = return_array())
{
	echo("Testcase 9 (filled array) results in TRUE\r\n");
}
else
{
	echo("Testcase 9 (filled array) results in FALSE\r\n");
}

/* 

Actual results:

Testcase 1 (boolean false) results in FALSE
Testcase 2 (boolean true) results in TRUE
Testcase 3 (null) results in FALSE
Testcase 4 (empty string) results in FALSE
Testcase 5 (filled string) results in TRUE
Testcase 6 (integer 0) results in FALSE
Testcase 7 (integer 1) results in TRUE
Testcase 8 (empty array) results in FALSE
Testcase 9 (filled array) results in TRUE

*/