优先级如何与PHP中的比较运算符一起使用？

Question

I'm using PHP 7.2.0

I wrote following code :

<?php
echo 1 <= 5 == 1;
?>

and I got following output in my web browser :

1

I expected none(false) or 0 to be the output but surprisingly I got 1 as an output.

I'm not able to understand how does the precedence get worked out here.

Can someone please explain me how the precedence got worked in this code in a step-by-step manner?

Thank You.

Answer 1

1 <= 5 is true ,
true == 1 is true ,
echo true outputs 1 .

The precedence is:

echo (1 <= 5) == 1;