php递归计算一个目录中所有文件的大小

sudo find /private/etc -exec ls -l {} \; | awk &＃39;BEGIN {sum&＃61;0} {sum&＃43;&＃61;$5;} END {print sum}&＃39; # 4947228
ls -ld /etc #/etc -> private/etc

先计算出/etc目录所有文件的大小4947228

DirUtil.php

/*** Created by PhpStorm.* User: Mch* Date: 8/14/18* Time: 22:11*/
class DirUtil {public static function getSize(string $path) {$totalSize &＃61; 0;$path &＃61; realpath($path);if (!file_exists($path)) {return $totalSize;}if (!is_dir($path)) {return filesize($path);}if ($dh &＃61; opendir($path)) {while (($file &＃61; readdir($dh)) !&＃61;&＃61; false) {if ($file !&＃61;&＃61; "." && $file !&＃61;&＃61; "..") {$abs &＃61; $path.DIRECTORY_SEPARATOR.$file;if (is_dir($file)) {$totalSize &＃43;&＃61; self::getSize($abs);} else {$totalSize &＃43;&＃61; filesize($abs);}}}closedir($dh);}return $totalSize;}public static function entryForEach(string $path, callable $callback, mixed $data &＃61; null) {$path &＃61; realpath($path);if (!file_exists($path)) {return 0;}if (!is_dir($path)) {return call_user_func($callback, $path, $data);}if ($dh &＃61; opendir($path)) {while (($file &＃61; readdir($dh)) !&＃61;&＃61; false) {if ($file !&＃61;&＃61; "." && $file !&＃61;&＃61; "..") {$abs &＃61; $path.DIRECTORY_SEPARATOR.$file;if (is_dir($file)) {self::entryForEach($abs, $callback, $data);} else {call_user_func($callback, $abs, $data);}}}closedir($dh);}return 0;}public static function entryReduce(string $path, callable $callback, $init) {$acc &＃61; $init;$path&＃61; realpath($path);if (!file_exists($path)) {return $acc;}if (!is_dir($path)) {return call_user_func($callback, $acc, $path);}if ($dh &＃61; opendir($path)) {while (($file &＃61; readdir($dh)) !&＃61;&＃61; false) {if ($file !&＃61;&＃61; "." && $file !&＃61;&＃61; "..") {$abs &＃61; $path.DIRECTORY_SEPARATOR.$file;if (is_dir($file)) {$acc &＃61; self::entryReduce($abs, $callback, $acc);} else {$acc&＃61; call_user_func($callback, $acc, $abs);}}}closedir($dh);}return $acc;}
}

test:

// php ./DirUtil.php /etc
if ($argc <2) {printf("Usage: php %s [filename]\n", __FILE__);exit(1);
}
echo DirUtil::getSize($argv[1]).PHP_EOL; // 899768$dir_get_size &＃61; function($path) {$size &＃61; 0;DirUtil::entryForEach($path, function($path) use (&$size) {$size &＃43;&＃61; filesize($path);});return $size;
};
echo $dir_get_size($argv[1]).PHP_EOL; // 899768echo DirUtil::entryReduce($argv[1], function($sum, $path) {$sum &＃43;&＃61; filesize($path);return $sum;
}, 0).PHP_EOL; // 899768