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PHP file operation: remove files or directories with a given path
PHP file operation: remove files or directories with a given path
In the previous article "php file operation: extracting the name of the file/directory", we learned about the method of obtaining the name part of the file/directory. This time we continue the PHP file operation series and talk about how to delete specified files or directories. Interested friends can learn about it~
When operating files/directories, not only can You can also operate on the data of the file/directory itself (such as deleting the file/directory). Today we will introduce to you how to delete specified files or directories.
1: Delete specified file operation
To delete a file, you can use the unlink($filename,$context) function, It can delete the specified file $filename, and the optional parameter $context is used to specify the environment of the file handle. Returns TRUE if the execution succeeds and FALSE if it fails.
Let’s take a look at the specific code examples:
Example 1: Delete the "test.txt" file in the same directory
<?php
header("content-type:text/html;charset=utf-8");
$file = 'test.txt';
if(file_exists($file)){
if(unlink($file)){
echo $file.' 删除成功！';
}else{
echo $file.' 删除失败！';
}
}else{
echo $file.' 不存在！';
}
?>The output result is:
After reopening the directory and looking at the files, you will find that the "test.txt" file no longer exists.
Example 2: Delete the "text.txt" file in the D:\demo directory
<?php
header("content-type:text/html;charset=utf-8");
$file = 'D:/demo/text.txt';
if(file_exists($file)){
if(unlink($file)){
echo $file.' 删除成功！';
}else{
echo $file.' 删除失败！';
}
}else{
echo $file.' 不存在！';
}
?>Output results For:
# After reopening the directory and looking at the files, you will find that the "text.txt" file no longer exists.
How to delete all files in a directory, you can use loops and readdir() to obtain all files and directories in the D:\demo directory (excluding subdirectories ), and then delete all the files in it:
<?php
header("content-type:text/html;charset=utf-8");
$dir = 'D:/demo';
if (is_dir($dir)) {
$info = opendir($dir);
while (($file = readdir($info)) !== false) {//用不全等于是区分如果文件夹名字为0的时候，那么0!==false，仍然可以遍历
if ($file != "." && $file != ".." ) {
$path = $dir . '/' . $file;
if(is_dir($path)){
continue;
}
unlink($path);
}
}
echo '文件删除成功！';
closedir($info);
}
?>The output result is:
After reopening the directory and looking at the files, you will find that only An "img" folder still exists.
2: Delete the specified directory operation
To delete a directory, you can usermdir($dir ,$context) function, $context is an omitted parameter, used to specify the environment of the file handle. Returns TRUE if the execution succeeds and FALSE if it fails.
It should be noted that when using the rmdir() function to delete the specified directory, the directory must be empty and must have corresponding permissions. Deleting a directory that is not empty will also generate an E_WERNING level error.
Let’s take a look at the specific code examples: Delete the empty directory “img” under the D:\demo directory
<?php
header("content-type:text/html;charset=utf-8");
$dir = 'D:/demo/img';
if(is_dir($dir)){
if(rmdir($dir)) echo '目录删除成功！';
}else{
echo "目录不存在！";
}
?>The output result is:
After reopening the directory and looking at the files, you will find that the empty directory "img" no longer exists.
But in most cases, the directory we need to delete is not empty, and it contains many sub-files and sub-directories. How can we delete it? What about the specified directory and its sub-files and directories?
Specific implementation method: You can traverse all files and folders in this directory and delete all files and folders in this directory one by one recursivelyAs given below Specific implementation code:<?php
function deldir($path){
//如果是目录则继续
if(is_dir($path)){
//扫描一个文件夹内的所有文件夹和文件并返回数组
$p = scandir($path);
//如果 $p 中有两个以上的元素则说明当前 $path 不为空
if(count($p)>2){
foreach($p as $val){
//排除目录中的.和..
if($val !="." && $val !=".."){
//如果是目录则递归子目录，继续操作
if(is_dir($path.$val)){
//子目录中操作删除文件夹和文件
deldir($path.$val.'/');
}else{
//如果是文件直接删除
unlink($path.$val);
}
}
}
}
}
//删除目录
return rmdir($path);
}
//设置需要删除的文件夹
$path = "D:/demo/";
//调用函数，传入路径
deldir($path);
?>《PHP interview questions summary (collection)》《php video tutorial》
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