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function microtime_float () { list ($usec, $sec) = explode(" ", microtime()); return ((float) $usec + (float) $sec); } function echotime ($name) { static $t_start = 0; $t_end = microtime_float(); if ($name != 'start') { $time = $t_end - $t_start; echo ($name . ':'); echo intval($time * 1000); echo "<br>\n"; } $t_start = $t_end; } $index = 1000; $loop = 10000; $length = 10000; $key = "abc" . $index; $array = array(); for ($i = 0; $i < $length; $i ++) { $array['abc' . $i] = 'abc' . $i; } echotime('start'); for ($i = 0; $i < $loop; $i ++) { if (array_key_exists($key, $array)) { $a = true; } } echotime('array_key_exists'); for ($i = 0; $i < $loop; $i ++) { if (isset($array[$key])) { $a = true; } } echotime('isset'); for ($i = 0; $i < $loop; $i ++) { if (in_array($key, $array)) { $a = true; } } echotime('in_array'); for ($i = 0; $i < $loop; $i ++) { if (array_search($key, $array)) { $a = true; } } echotime('array_search'); $array2 = array_flip($array); for ($i = 0; $i < $loop; $i ++) { if (isset($array2[$key])) { $a = true; } } echotime('flip and search'); $array2 = $array; foreach ($array2 as $k => $v) { $array2[$k] = strtoupper($v); } echotime('foreach1'); $array2 = $array; foreach ($array2 as &$v) { $v = strtoupper($v); } echotime('foreach2'); $array2 = $array; $array2 = array_map('strtoupper', $array2); echotime('array_map');