True/False Question

[dennismonsewicz]

I am trying to understand telling a function to return true or false and was wondering if the following code is right.

 

function helloWorld($param) {
if(isset($param)) {
	return true;
} else {
	return false;
}
}

if(helloWorld('test') != false) {
echo 'it worked!';
} else {
echo 'Nope!';
}

[premiso]

Here is a bit more of an explanation, yes the code is right to an extent.

 

function helloWorld($param) {
   if(isset($param)) {
      return true;
   } else {
      return false;
   }
}

// will work.
if(helloWorld('test') != false) {
   echo 'it worked!';
} else {
   echo 'Nope!';
}

// will also work
if(helloWorld('test')) {
   echo 'it worked!';
} else {
   echo 'Nope!';
}

// Will also work
if(helloWorld('test') !== false) {
   echo 'it worked!';
} else {
   echo 'Nope!';
}

 

Either of the 3 works, the first method check if the value is false, meaning 0 would count. The second is just passing the return value to the IF statement as if statement check for true / false conditions so why add the check there (unless you need to verify the false) which is where the !== comes into play. That verifies that is false and the type is a boolean and not just 0.

 

Hope that helps ya.

[dennismonsewicz]

Thanks! that actually makes a lot of since. I appreciate your help!