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opendir() 函数

opendir() 函数打开一个目录句柄,可由 closedir(),readdir() 和 rewinddir() 使用。

若成功,则该函数返回一个目录流,否则返回 false 以及一个 error。可以通过在函数名前加上 "@" 来隐藏 error 的输出。

语法为 opendir(path,context)。

  • 参数 path,必需。规定要打开的目录路径。
  • 参数 context,可选。规定目录句柄的环境。context 是可修改目录流的行为的一套选项。

下面是一个例子:

<?php
//打开 images 目录
$dir = opendir("bkjia");

//列出 images 目录中的文件
while (($file = readdir($dir)) !== false)
{
	echo "filename: " . $file . "<br />";
}
closedir($dir);
?> 

程序输出:

filename: .
filename: ..
filename: cat.gif
filename: dog.gif
filename: food
filename: horse.gif

这里把子目录和文件都输出了,现在只需要把子目录输出,可以用下面的函数实现:

<?php

function getSubDirs($dir) 
{
	$subdirs = array();
	if(!$dh = opendir($dir)) 
		return $subdirs;
	$i = 0;
	while ($f = readdir($dh)) 
	{
     	if($f =='.' || $f =='..') 
			continue;
		//如果只要子目录名, path = $f;
 		//$path = $dir.'/'.$f;  
		$path = $f;
		$subdirs[$i] = $path;
		$i++;
	}
	return $subdirs;
}

$arr = getSubDirs("tmp");
print_r($arr); 
?>

程序运行结果为:

Array ( [0] => Hello [1] => NowaMagic )

这次可以实现需求了。

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