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php mkdir and mkdirs operations on directories_PHP tutorial

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How to use mkdir to create multi-level directories in PHP

2012-09-09 17:50:58| Category: Default category

At the beginning, I thought that mkdir can create a folder as long as a path is given, but that is not the case. A single mkdir can only create one-level directories, but not multi-level ones.

So how to use mkdir to create it? First, let me copy a description of mkdir from the manual, as follows:

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

Try to create a new directory specified by pathname.

Note that you may want to specify the mode as an octal number, which means that the number should start with zero. The mode is also 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 maximum possible access. For more information about mode please read the chmod() page. Example 1. mkdir() example

mkdir("/path/to/my/dir", 0700);
?>

Returns TRUE on success, FALSE on failure.

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. Use new methods in PHP5

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 this does not work for PHP4.

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

Here, I will give a little explanation on the second method. There are two methods, as follows:

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

php mkdir and mkdirs operations on directories_PHP tutorial

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);

}

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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 folders in existing directories (that is, the parent must exist).
mkdirs() can create folders in non-existing directories. For example: a\b, you can create multi-level directories.

dirname() returns the directory portion of the path.

is_dir() is used to determine whether the given file name is a valid directory

2. The general process is:
(1) First use is_dir to determine whether it is already a folder, and if so, return TRUE. 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 passed parameters 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. level, if successful (returns FALSE if unsuccessful), then use mkdir to create the final directory.

Okay, the above is the first option.

Second type

(Note: This solution is quite streamlined, and it is a very good solution. It is recommended to use it)

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

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Description:

General process: After getting the path, first determine whether it is a valid file directory, if so, return and end the program. If not, (because OR is used as the selective condition here, that is, as long as one of the conditions is met), it will call itself recursively, and there will be one less directory in the passed in path. In this way, first go back to the parent directory of the upper level, and then use mkdir to create the next level.

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 this will not work for PHP4.

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

3. You can still use mkdir to create multi-level folders very cleverly.