[Insight] Boolean should be compared strictly - in Event/FilterLocaleSwitchEvent.php, line 39

[lunetics]

in Event/FilterLocaleSwitchEvent.php, line 39

With booleans, only strict comparison (with === operator) should be used to lower bug risks and to improve performances.

     *
     * @throws \InvalidArgumentException
     */
    public function __construct(Request $request, $locale)
    {
        if (!is_string($locale) || null == $locale || '' == $locale) {
            throw new \InvalidArgumentException(sprintf('Wrong type, expected \'string\' got \'%s\'', $locale));
        }

        $this->request = $request;
        $this->locale = $locale;

---

Posted from SensioLabsInsight

I think we should only use if(!is_string($locale)) {.
Edit: Or if(!is_string($locale) || !empty($locale)) { if empty strings should be forbidden.

is_string(false) = bool(false)
is_string(true) = bool(false)
is_string(NULL) = bool(false)
is_string('abc') = bool(true)
is_string('23') = bool(true)
is_string(23) = bool(false)
is_string('23.5') = bool(true)
is_string(23.5) = bool(false)
is_string('') = bool(true)
is_string(' ') = bool(true)
is_string('0') = bool(true)
is_string(0) = bool(false)

http://php.net/manual/de/function.is-string.php

As explained here: #161 (comment)
we should do if(!is_string($locale) || '' === $locale) {.