函数和if中的其他PHP

Question

i dont understand how the if statement works and the function is called, why i am getting "He has more strength", i know because the strength is greater, but what i am getting there, is it a boolean? can i dump it, it shows me NULL if i put this inside the if statement

edit:i have added the return.

<?php
class Ship
{
public $name;
public $strength = 0;

    public function doesGivenShipHaveMoreStrength($givenShip)
    {
         return $givenShip->strength > $this->strength;
    }
}

$myShip = new Ship();
$myShip->name = 'TIE Fighter';
$myShip->strength = 150;

$otherShip = new Ship();
$otherShip->name = 'Imperial Shuttle';
$otherShip->strength = 50;


if ($myShip->doesGivenShipHaveMoreStrength($otherShip)) {

 echo $otherShip->name.' He has more strength';

} else {
    echo $myShip->name.' She has more strength';

}


?>

Answer 1

If statements evaluates whatever inside it's braces () . if true or 1 the block or statement will be executed. your function returned a value , and that returned value is later evaluated by the if statement. these are examples that might help you understand how if statements work. the same goes with almost every other programming language.

//example 1
if(true){
    // will be executed
}else{
    // will not executed
}
//example 2
if(false){
    // will not executed
}else{
    // will be executed
}

//example 3
if( 2 > 1){
    // will be executed
}else{
    // will not executed
}
//example 4
if(1){
    // will be executed
}else{
    // will not executed
}
//example 5
if(0){
    // will not executed
}else{
    // will be executed
}
//example 5
if(myFunction()){
    // will be executed
}else{
    // will not executed
}
function myFunction()
{
    return true;
}