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<?php // -------------------- // foo() will never get called as those operators are short-circuit $a = (false && foo()); $b = (true || foo()); $c = (false and foo()); $d = (true or foo()); // -------------------- // "||" has a greater precedence than "or" // 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 $f before the "or" operation occurs // Acts like: (($f = false) or true) $f = false or true; var_dump($e, $f); // -------------------- // "&&" has a greater precedence than "and" // The result of the expression (true && false) is assigned to $g // Acts like: ($g = (true && false)) $g = true && false; // The constant true is assigned to $h before the "and" operation occurs // Acts like: (($h = true) and false) $h = true and false; var_dump($g, $h); ?>