wat in php

wat.php

// '0', 0, and 0.0 are false, but '0.0' is true

// If a function returns an Array, you just can not write
$first_element = function_returns_array()[0]; //Syntax ERROR!!
$first_element = ( function_returns_array() )[0]; //This neither!!
//Instead you must write
$a = function_returns_array();
$first_element = $a[0];