Result
Unfortunately, no history for this test is available.
Code
The first test, "(bool)", was:
for ($j = 0; $j < 1000; $j++) { $i = '1'; $GLOBALS['dummy'] = isset($i) && (bool) $i; }
The second test, "!empty()", was:
for ($j = 0; $j < 1000; $j++) { $i = '1'; $GLOBALS['dummy'] = !empty($i); }