PHP benchmark static function, object function, function

bench.php

<?php

class SomeStaticClass
{
    public static function doTest($i) {
        sqrt($i);
    }
}

class SomeClass
{
    public function doTest($i) {
        sqrt($i);
    }
}

function someTest($i){
    sqrt($i);
}

// bench static method
$startTime = microtime(true);
for ($i = 0; $i< 10*1000*1000; $i++)
    SomeStaticClass::doTest($i);

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

// bench object method
$startTime = microtime(true);
$someObj = new SomeClass();
for ($i = 0; $i< 10*1000*1000; $i++)
    $someObj->doTest($i);

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

// bench function
$startTime = microtime(true);
for ($i = 0; $i< 10*1000*1000; $i++)
    someTest($i);

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