PHP traverses files and folder names in a folder_PHP tutorial

opendir() function

The opendir() function opens a directory handle and can be used by closedir(), readdir() and rewinddir().

If successful, this function returns a directory stream, otherwise it returns false and an error. You can hide error output by prepending "@" to the function name.

The syntax is opendir(path,context).

• Parameter path, required. Specifies the directory path to be opened.
• Parameter context, optional. Specifies the environment for directory handles. context is a set of options that modify the behavior of the directory stream.

Here is an example:

<?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);
?> 

Program output:

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

Both subdirectories and files are output here. Now you only need to output the subdirectory, which can be achieved by using the following function:

<?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); 
?>

The result of running the program is:

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

This time the requirement can be realized.