Question

Given the statement:

if($value && array_key_exists($value, $array)) {

         $hello['world'] = $value;

        }

Would it be best to use the logical operator AND as opposed to &&?

Answer 1

On their own, they do exactly the same. So a && b means the same than a and b. But, they are not the same, as && has a higher precedence than and. See the docs for further information.

This example here shows the difference:

// The result of the expression (false && true) is assigned to $e
// Acts like: ($e = (false && true))
$e = false && true;

// The constant false is assigned to $f and then true is ignored
// Acts like: (($f = false) and true)
$f = false and true;