Introduction to the use of mkdir in php

How PHPmkdir creates a multi-level directory

First of all, let’s explain that many friends may think that mkdir can create files as long as they give a path. Folder, in fact, it is not like that. A single MKDIR can only create one-level directories, but not multi-level directories. So how to use mkdir to create it?

The description of mkdir in the manual is as follows:

Instructions

bool mkdir ( string pathname [, int mode [, bool recursive [, resource context]]] )

Try to create a new directory specified by pathname.

Note: You may want to specify the mode using an octal number, which means that the number should start with zero. The mode will also be modified by the current umask, which can be changed with umask().

Note: mode is ignored under Windows. Optional since PHP 4.2.0.

The default mode is 0777, which means the greatest possible access. For more information about mode please read the chmod() page.

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Example 1. mkdir() Example

Returns TRUE if successful, if failed Returns FALSE.

Note: Since PHP 5.0.0 rmdir() can also be used with certain URL wrapping protocols. See Appendix N for a list of which URL encapsulation protocols rmdir() supports.

Note: Support for context was added in PHP 5.0.0. For a description of context, see Reference CLX, Stream Functions.

Note: The recursive parameter was added in PHP 5.0.0.

Note: When safe mode is activated, PHP will check whether the directory being manipulated has the same UID (owner) as the script being executed.

The above is the description information in the PHP5 manual, that is, you can create a folder like this: mkdir('./test',0777). But how to create multi-level directories recursively?

The methods are:

1. The directory creation function mkdir under PHP5 adds a new parameter recursive. By setting recursive to true, the purpose of recursively creating a directory can be achieved, but it does not work for PHP4. .

2. Write your own recursive method to create multi-level directories.

Here, I will explain the second method. There are two methods, as follows:

The first one (use mkdirs to generate multi-level parents)

function mkdirs($dir, $mode = 0777)
{    
if (is_dir($dir) || @mkdir($dir, $mode)) return TRUE;    
if (!mkdirs(dirname($dir), $mode)) return FALSE;    
return @mkdir($dir, $mode);
}

Description:
1. First, let’s briefly talk about the difference between mkdir() and mkdirs(), as well as is_dir and dirname():

mkdir() can only create files in existing directories. folder (that is, the parent must have it).

mkdirs() can create folders in non-existing directories. For example: a//b, you can create multi-level directories.

dirname() is the directory part of the returned path.

is_dir() is used to determine whether the given file name is a valid directory. is a folder, returns TRUE if so. If it doesn't exist (or it's not a folder), try to create it. Of course, the parent may not exist, then mkdir will not be created successfully, but it will not report an error, so use @ to suppress non-fatal errors.

(2) If none of the parameters passed meet the conditions, then enter the second if statement. First, obtain the directory part of the path. Of course, it may be a multi-level parent that does not exist, so mkdirs is used. () to create the parent first. If successful (returns FALSE if unsuccessful), then use mkdir to create the final directory.

function create_folders($dir){
       return is_dir($dir) or (create_folders(dirname($dir)) and mkdir($dir, 0777));
 }

Okay, the above is how to create folders (and multi-level folders) using PHP. ^_^

Summary:

1. Use a new parameter recursive in mkdir that comes with PHP5. By setting recursive to true, you can achieve the purpose of recursively creating directories, but for PHP4 That won’t work.

2. In the method written by myself, use mkdirs to create multi-level parent directories

3. Still use mkdir to create it very cleverly

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