回归和回声

Question

What happens if i echo something before a return in a PHP function? An example of this is the following:

protected function getStockFromGarp($data) {
    echo $data." stock returned from call ".$url;            
    return $data; // Returning $data for future date
}

public function updateStock($sku) {
    $entry->this = getStockFromGarp($sku);
}

Which will be the $entry->this value when calling updateStock($var)?

Answer 1

PHP will first do the echo and then return $data. Echo outputs data but does not stop PHP from rparsing.

Maybe this will make it more clear:

class Conversation
{
    public $knowledge = array();

    public function say($string)
    {
        // echo $string;
        return $string;
    }

    public function listen($string)
    {
        $this->knowledge[] = $string;
    }
}

$me = new Conversation();
$johnDoe = new Conversation();

$johnDoe->listen($me->say("I've got a secret"));
$me->listen($johnDoe->say("Tell me!"));

If you were to use echo, I would've said that I had a secret, but John Doe would never be able to hear me.