Benchmark: PHP Reverse

gistfile1.txt

<?php

$test_array = array(0,1,2,3,4,5);

function getmicrotime()
{
	list($usec, $sec) = explode(' ',microtime());
	return ((float)$usec + (float)$sec);
}

$time_start = getmicrotime();
for ($i=0; $i<1000000; $i++)
{
	$j = count($test_array)-1;
	$result_array = array();

	while ($j >= 0)
	{
		$result_array[] = $test_array[$j];
		$j--;
	}
}
echo 'while() :: '.number_format(getmicrotime()-$time_start,3).' seconds<br/>';
//var_dump($result_array);

$time_start = getmicrotime();
for ($i=0; $i<1000000; $i++)
{
	$length = count($test_array)-1;
	$result_array = array();

	for ($j=$length; $j>=0; $j--)
	{
		$result_array[] = $test_array[$j];
	}
}
echo 'for() :: '.number_format(getmicrotime()-$time_start,3).' seconds<br/>';
//var_dump($result_array);

$time_start = getmicrotime();
for ($i=0; $i<1000000; $i++)
{
	$result_array = array();

	for ($j=count($test_array)-1; $j>=0; $j--)
	{
		$result_array[] = $test_array[$j];
	}
}
echo 'for() optimized :: '.number_format(getmicrotime()-$time_start,3).' seconds<br/>';
//var_dump($result_array);

$time_start = getmicrotime();
for ($i=0; $i<1000000; $i++)
{
	$result_array = array();

	foreach($test_array as $j)
	{
		array_unshift($result_array, $test_array[$j]);
	}
}
echo 'foreach / array_unshift :: '.number_format(getmicrotime()-$time_start,3).' seconds<br/>';
//var_dump($result_array);

$time_start = getmicrotime();
for ($i=0; $i<1000000; $i++)
{
	$result_array = array_reverse($test_array, false);
}
echo 'array_reverse:: '.number_format(getmicrotime()-$time_start,3).' seconds<br/>';
//var_dump($result_array);

$time_start = getmicrotime();
for ($i=0; $i<1000000; $i++)
{
	$result_array = array_reverse($test_array, true);
}
echo 'array_reverse (preserve keys):: '.number_format(getmicrotime()-$time_start,3).' seconds<br/>';
//var_dump($result_array);