带有数字PHP的if语句中的逻辑

Question

Can someone explain what's happening here:

if(2 && 5 < 4)

If i've got for example

$x = 2 && 3;

and var_dump($x) it gives boolean(true) no matter what numbers are. But here it looks like numbers are comparing to 4 one by one.

Answer 1

Look at the PHP comparison table for PHP http://php.net/manual/en/types.comparisons.php

For integers a number other than 0 returns true in comparison.

if (2 && 5 < 4) => if (true && false) => false

$x = 2 && 3 = 1 && 1 = 1

because if a variable has an integer value, true becomes 1 because of type conversion.