Why is the output 1

Question

Hey, I'm new to PHP so I just wanna know why the output for this code is 1
https://code.sololearn.com/wti97MwpOF2y/?ref=app

Answer 1

== operator evaluates the values of variables and returns 1 in your example. In php true is equivalent with 1.
=== operator evaluates the value and type of the variables and returns null in your example