JavaScript has some niche uses for ==, like checking for null or undefined in one check:

undefined == null; // true

It handles plenty of other cases with == just like you’d expect:

5 == true; // false
0 == null; // false
5 == "5 maids milking"; // false

A few other cases are kind of strange due to type juggling, which is why === is almost always better:

0 == false; // true
1 == true; // true! What is this, C?
1 == "1"; // true

PHP, however, takes the idea of type juggling a step further:

<?php

// Same as JS above
0 == false; // true
1 == true; // true
1 == "1"; // true

// ???
0 == null; // true
5 == true; // true
0 == "hello"; // true
5 == "5 jacks jumping"; // true
"0e04" == "0e08"; // WHAT!?

PHP’s == operator is never the correct choice. There’s no undefined vs nil to work with, and the comparisons that pass are nonsensical!