Question

What does return true; and return false; exactly responds in user defined functions?

function valid_image($image, $target, $width, $height = 0) {

        if($image["type"] !== "image/jpeg") {
            alert('File must be of type image/jpeg');
            return false;
        }
        if(file_exists($target.$image['name'])) {
            alert('File Already Exists, Please Choose a Different Name for the File');
            return false;
        }
        return true;
   }

Considering the above example if the first condition if($image["type"] !== "image/jpeg" returns true. Does the return false; statement right below it stop the script from executing the below code ?

Answer 1

If the first statement evaluated to true, then the return false immediately under it will end the function (I should say alert() will be called first).