PHP 배열 키-값 변환 속도 경쟁

$arr = range(1, 1000000); // 使用 array_flip() $start = microtime(true); $flipped = array_flip($arr); $end = microtime(true); $time_array_flip = $end - $start; // 使用 array_combine() $keys = range('a', 'z'); $start = microtime(true); $combined = array_combine($keys, $arr); $end = microtime(true); $time_array_combine = $end - $start; // 使用 array_map() $start = microtime(true); $mapped = array_map(function($x) { return [$x, $x]; }, $arr); $end = microtime(true); $time_array_map = $end - $start; // 使用 foreach() 和 array_keys() $start = microtime(true); $flipped = []; $keys = array_keys($arr); foreach ($keys as $key) { $flipped[$key] = $arr[$key]; } $end = microtime(true); $time_foreach = $end - $start; // 使用自定义循环 $start = microtime(true); $flipped = []; for ($i = 0; $i < count($arr); $i++) { $flipped[$arr[$i]] = $arr[$i]; } $end = microtime(true); $time_custom = $end - $start; // 显示结果 echo "array_flip(): $time_array_flip s\n"; echo "array_combine(): $time_array_combine s\n"; echo "array_map(): $time_array_map s\n"; echo "foreach() + array_keys(): $time_foreach s\n"; echo "自定义循环: $time_custom s\n";