Performance of static methods vs. functions

Question

In PHP, (unlike what I originally thought) there is an overhead of calling static methods vs simple functions.

On a very simple bench, the overhead is over 30% of th

Answer 1

I am following up what Morgan Touverey Quilling did but with PHP 7. Did 3 iterations incase it takes longer for the first run vs subsequent runs. Includes all classes as it might be done realistically. All included files just return the input.

include 'lib/global.php';
include 'SomeClass.php';
include 'StaticTest.php';

$someObj = new SomeClass();

$starttime = microtime(true);
for ($i = 0; $i< 10*100000; $i++)
    StaticTest::doStaticTest($i);

echo "
Static Time:   " , (microtime(true)-$starttime) , " ms\n";

// bench object method
$starttime = microtime(true);

for ($i = 0; $i< 10*100000; $i++)
    $someObj->doObjTest($i);

echo "
Object Time:   " , (microtime(true)-$starttime) , " ms\n";

// bench function
$starttime = microtime(true);

for ($i = 0; $i< 10*100000; $i++)
    something_doTest($i);

echo "
Function Time: " , (microtime(true)-$starttime) , " ms\n";

echo "
Static Time:   " , (microtime(true)-$starttime) , " ms\n";

// bench object method
$starttime = microtime(true);

for ($i = 0; $i< 10*100000; $i++)
    $someObj->doObjTest($i);

echo "
Object Time:   " , (microtime(true)-$starttime) , " ms\n";

// bench function
$starttime = microtime(true);

for ($i = 0; $i< 10*100000; $i++)
    something_doTest($i);

echo "
Function Time: " , (microtime(true)-$starttime) , " ms\n";

echo "
Static Time:   " , (microtime(true)-$starttime) , " ms\n";

// bench object method
$starttime = microtime(true);

for ($i = 0; $i< 10*100000; $i++)
    $someObj->doObjTest($i);

echo "
Object Time:   " , (microtime(true)-$starttime) , " ms\n";

// bench function
$starttime = microtime(true);

for ($i = 0; $i< 10*100000; $i++)
    something_doTest($i);

echo "
Function Time: " , (microtime(true)-$starttime) , " ms\n";

Just note that this is being done on one of my webhosts as its easier to switch php versions so might be some noise.

PHP 7.0.33

Static Time:   0.14076709747314 ms
Object Time:   0.16203689575195 ms
Function Time: 0.13194108009338 ms
Static Time:   0.13194918632507 ms
Object Time:   0.1779100894928 ms
Function Time: 0.13044309616089 ms
Static Time:   0.13045001029968 ms
Object Time:   0.16074585914612 ms
Function Time: 0.13029479980469 ms 

PHP 7.1.29

Static Time:   0.13407206535339 ms
Object Time:   0.13267111778259 ms
Function Time: 0.1302649974823 ms
Static Time:   0.13027906417847 ms
Object Time:   0.1390438079834 ms
Function Time: 0.16873598098755 ms
Static Time:   0.16874289512634 ms
Object Time:   0.13901305198669 ms
Function Time: 0.12576103210449 ms 

PHP 7.2.18:

Static Time:   0.1657600402832 ms
Object Time:   0.15700101852417 ms
Function Time: 0.1484169960022 ms
Static Time:   0.14842295646667 ms
Object Time:   0.16168689727783 ms
Function Time: 0.17508292198181 ms
Static Time:   0.17508983612061 ms
Object Time:   0.19771790504456 ms
Function Time: 0.1468551158905 ms 

PHP 7.3.5

Static Time:   0.10701704025269 ms
Object Time:   0.097011089324951 ms
Function Time: 0.075740098953247 ms
Static Time:   0.07575798034668 ms
Object Time:   0.083790063858032 ms
Function Time: 0.072473049163818 ms
Static Time:   0.072479009628296 ms
Object Time:   0.081503868103027 ms
Function Time: 0.071882963180542 ms 

PHP 7.2 seemed to run a lot slower than the other versions on average. I found their lowest number but it got into the low .2####'s too. Don't' have 7.4 as of right now.