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<?php function returnTime(callable $function) { $count = 100; $repeat = 100; $tests = []; for ($i = 0; $i < $repeat; $i++) { $tests[$i] = []; for ($i = 0; $i < $count; $i++) { $startTime = microtime(true); $function(); $endTime = microtime(true); $tests[$i][] = $endTime - $startTime; } } foreach ($tests as &$test) $test = array_sum($test); return array_sum($tests) / $repeat; } function compareResults($result1, $name1, $result2, $name2) { $results = [ $result1, $result2, ]; $names = [ $name1, $name2, ]; if ($results[0] == $results[1]) { return 0; } if ($results[0] < $results[1]) { $fasterIndex = 0; } else { $fasterIndex = 1; } $slowerIndex = 1 - $fasterIndex; $fasterResult = $results[$fasterIndex]; $slowerResult = $results[$slowerIndex]; echo "{$names[$fasterIndex]} performs faster than {$names[$slowerIndex]}.", PHP_EOL; echo "It is ", round(($slowerResult / $fasterResult) * 100 - 100), "% faster.", PHP_EOL; } // Array with 500000 elements $array = array_fill(0, 500000, 1); compareResults( returnTime(function () use ($array) { end($array); $lastKey = key($array); reset($array); }), "end()", returnTime(function () use ($array) { $lastKey = key(array_slice($array, -1, 1, true)); }), "array_slice()" );

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