Php sample function with unit test cases

IcyHot.php

<?php

 $count= 0;
  $errs = 0;

 /**
     * Target function, this function is the main function to implement. The signature should be same as
     in your question.
     

     * Sample Question:
     Given two temperatures, return true if one is less than 0 and the other is greater than 100.

     icyHot(120, -1) : true
     icyHot(-1, 120) : true
     icyHot(2, 120) : false

     For debug can have system out println here but in reference website need to comment out.


    public boolean icyHot($temp1, $temp2) {
        if(temp1 < 0 && temp2> 100)return true;//sample answer, incomplete
        return false;
    }
         */
         
function icyHot($temp1, $temp2) {
	if($temp1 < 0 && $temp2 > 100)return true;
	return false;
}

function testIcyHot($temp1, $temp2, $expectedReturn) {
	global $count, $errs;
       $actualReturn = false ;
        $count++;
        try {
            $actualReturn = icyHot($temp1, $temp2);
        } catch (Exception $e) {
            echo ("err " .  $e);
            
        }

        if ($actualReturn != $expectedReturn) {
            echo("Actual :" . $actualReturn . ", expected :" . $expectedReturn . ", for temp1 :" . $temp1 . ", temp2 :" . $temp2
                    . ", count :" . $count .".");
            $errs++;
        }
    }

function testCases(){
		global $count, $errs;
	echo("testCases :" );
	testIcyHot(0, 0, false);
        testIcyHot(0, 101, false);
        testIcyHot(-1, 101, true);
        testIcyHot(500, -101, true);
        testIcyHot(0, 101,false);
        testIcyHot(-100, 1999, true);
        echo("\n\nIcy Hot test cases result :- count : $count,\n\n Errors (test case expected value wrong or implmentaion wrong or problem understanding wrong): $errs . \n\n");
}

 testCases();
?>