What is the use of php directory operation function?

The functions of php directory operation functions: 1. The opendir function is used to open the directory; 2. The readdir function is used to read the directory; 3. The mkdir function is used to create the directory; 4. The rmdir function is used to delete the directory, etc. wait.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

Explanation of functions related to directory operation of PHP

This article is suitable for beginners who are new to PHP to have a relevant understanding of directory operation functions.

<?php 
/**
目录相关操作函数
之前我们知道article下有a.txt b.txt c.txt d.txt 我们才去写
但是当文件下有e.html f.mp3.。。。我们只要处理txt文件
使用glob() 匹配文件
****/
//print_r(glob(&#39;*.txt&#39;)); //glob()查找的是当前目录下的匹配的
//print_r(glob(&#39;./article/*.txt&#39;));//OK
 
//glob()在工作中很有用，但是今天重点不是
//为了查看目录下的所有文件，用opendir
/*
opendir   打开目录，返回资源句柄,可用于之后的 closedir()，readdir() 和 rewinddir() 调用中。
readdir   读取目录 \,成功则返回文件名 或者在失败时返回 FALSE ,因此我用NULL是不对的
mkdir 创建目录
rmdir 删除目录
closedir   关闭目录
is_dir 判断是否是目录
unlink 删除文件
*/
$path = &#39;./misc&#39;;
 
var_dump(opendir($path));//resource(3, stream)
 
$dh = opendir($path);
/*
echo readdir($dh); // . 
echo readdir($dh); // ..
echo readdir($dh); // a.txt
echo readdir($dh); // b.exe
// . 和 .. 是虚拟目录，当前目录和上级目录，
*/
echo "<hr />";
 
//判断目录
while (($filename = readdir($dh)) !== false) { //直接判断真假是不对的，因为可能会出现0，因此使用false
echo $filename;
if (is_dir(&#39;./misc/&#39;.$filename)) {
echo "是目录";
}
echo "<br />"; 
}
 
//创建
foreach (array(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;) as $v) {
$path = &#39;./misc/&#39;.$v; //意思是在misc下创建目录
if (file_exists($path) && is_dir($path)) {//先判断是否存在并且是目录
echo $path."已经存在<br />";
}else if (mkdir($path)) {
echo $path."创建成功<br />";//第一次创建成功了，第二次创建就会失败，因为目录已经存在了
} else{
echo $path."创建失败<br />";
}
}
 
//删除目录
foreach (array(&#39;a&#39;, &#39;c&#39;, &#39;e&#39;) as $v) {
$path = &#39;./misc/&#39;.$v;
 
if (file_exists($path) && is_dir($path)) {
if (rmdir($path)) {  //因为在linux下权限控制比较严格，所以要判断是否删除成功
echo $path."目录删除成功<br />"; //非空目录禁止删除，rmdir只能删除非空目录
}else{
echo $path."目录删除失败<br />";
} 
}else{
echo $path."目录不存在<br />";
}
 
}
 
 
//关闭目录
closedir($dh);

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