PHP中遍历目录的两种方法

PHP中两种遍历某个目录下的子目录及文件的方法，遍历时主要是采用递归的算法，读某个目录下面的内容时，如果是目录，则递归遍历此目录，如果是文件，则将结果追加到数组中，同时数组用全局变量，定义在函数的外面，这样便于数组一直将结果递增起来。

方法一

$dir = "e:/myphp/research/mailapi";
$dirs = array();

function scan_dir($dir) {
    global $dirs;
    if (!is_dir($dir)) return false;

    if ($dh = opendir($dir)) {
        while (($file = readdir($dh)) !== false) {
            if ($file[0] == '.') continue;
            $fullpath = "$dir/$file";
            $dirs[] = $fullpath;
            if (is_dir($fullpath)) scan_dir($fullpath);           
        }
        closedir($dh);
    }

    return $dirs;
}
//scan_dir($dir);
//print_r($dirs);

方法二

function scan_dir2($dir) {
    global $dirs;
    if (!is_dir($dir)) return false;

    if ($dh = dir($dir)) {
        while (($file = $dh -> read()) !== false) {
            if ($file[0] == '.') continue;
            $fullpath = "$dir/$file";
            $dirs[] = $fullpath;
            if (is_dir($fullpath)) scan_dir2($fullpath);           
        }
        $dh- >close();
    }

    return $dirs;
}
scan_dir2($dir);
print_r($dirs);

部分结果：
 

Array
(
[0] => e:/myphp/research/mailapi/163
[1] => e:/myphp/research/mailapi/163/163.php
[2] => e:/myphp/research/mailapi/baseclass
[3] => e:/myphp/research/mailapi/baseclass/baseclass.php
[4] => e:/myphp/research/mailapi/gmail
[5] => e:/myphp/research/mailapi/gmail/9063271b89460d5d4395cdfae8994089
[6] => e:/myphp/research/mailapi/gmail/gmail-lite
[7] => e:/myphp/research/mailapi/gmail/gmail-lite/chat.gif
[8] => e:/myphp/research/mailapi/gmail/gmail-lite/clip.gif
[9] => e:/myphp/research/mailapi/gmail/gmail-lite/compose.php
[10] => e:/myphp/research/mailapi/gmail/gmail-lite/config.php
[11] => e:/myphp/research/mailapi/gmail/gmail-lite/diagnose.php
[12] => e:/myphp/research/mailapi/gmail/gmail-lite/dl.php
[13] => e:/myphp/research/mailapi/gmail/gmail-lite/favicon.ico
[14] => e:/myphp/research/mailapi/gmail/gmail-lite/glite.css
...
...
[15] => e:/myphp/research/mailapi/gmail/gmail-lite/index.php
 

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