Historical Results
Based on (2) saved test runs, The test labeled "if ($x && $y)" was (on average) the faster by 0.0097 seconds, (1.117% faster)
The if ($x && $y) test took 0.8582 seconds.
The if ($x) if ($y) test took 0.8678 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 210,422 loops for a total of 4,208,430 runs.
- Line execution difference (0.000002) milliseconds.
- Avg difference (0.000) milliseconds per 210,422 loops.
- Total difference 9.69 milliseconds for 4,208,430 loops
The iteration variablity for Code 1 was (0.0000) milliseconds and Code 2 was (0.0000) milliseconds. The lower and the closer together there values are the more accurate the results are.
Code
The first test, "if ($x) if ($y)", was:
for ($i = 0; $i < 100; $i++)
{
if ($GLOBALS['dummy_false'] === false)
if ($GLOBALS['dummy_true'] === true)
$GLOBALS['dummy'] = 42;
}
The second test, "if ($x && $y)", was:
for ($i = 0; $i < 100; $i++)
{
if ($GLOBALS['dummy_false'] === false && $GLOBALS['dummy_true'] === true)
$GLOBALS['dummy'] = 42;
}