Php Directory operation function summary

Source: Internet
Author: User
Tags mkdir php file rewind

Php creates directory folder function mkdir (). Its structure is as follows:

Kdir (string $ dirname, [int $ mode])

The $ dirname parameter is the name of the directory to be created. The $ mode parameter is optional. It is an integer variable and indicates the creation mode.

Instance:

The code is as follows: Copy code

<? Php
$ Name = "php ";
$ D = mkdir ($ name, 0777);/* 0777 indicates the maximum access permission */
If ($ d ){
Echo "created successfully ";
 }
Else echo "creation failed ";
?>


Php provides many methods to traverse directories. Here, we will introduce in detail how php traverses files in directories through examples.

Code:

The code is as follows: Copy code
<? Php
Function directory ($ dir) {/* declare a function */
$ Dp = opendir ($ dir);/* open the directory */
While ($ file = readdir ($ dp) {/* read directory */
If ($ file! = "." & $ File! = "..") {/* Determine whether there is a ".." or ".." file */
$ Path = $ dir. "/". $ file;/* obtain the directory path */
If (is_dir ($ path) {/* determine whether a subdirectory exists */
Directory ($ path);/* recursive function call */
    }
Else echo $ path. "<br>";/* Display file */
   }
  }
Closedir ($ dp );
 }
 
Directory ("e: wp ");
?>

The php directory reading function readdir () can read all files and folders in the directory. Its structure is as follows:


Readdir ($ dp );

The $ dp parameter is used to open the resource object returned by the Directory using the opendir () function. The function returns the file name under the Directory.

Instance:

The code is as follows: Copy code

<? Php
$ Dir = opendir ("study ");
While ($ read = readdir ($ dir )){
Print ($ read. "<br> ");
 }
?>

Php uses closedir () to close the directory function. Its structure is as follows:

Closedir ($ dp)

The $ dp parameter is used to open the resource object returned by the Directory using the opendir () function.

Instance:

The code is as follows: Copy code
<? Php
$ Mulu = "study ";
$ Dir = opendir ($ mulu );
Closedir ($ dir );
?>

If the function closedir () is used to close the directory successfully, the value 1 is not returned. Therefore, you cannot use the if statement to determine whether the directory is successfully closed.

I have introduced a series of php file operations, and then I will introduce how to operate directories. Php Directory functions are similar to File functions. Here we first introduce the Open Directory function opendir (). Its structure is as follows:


Opendir (string $ path)


The $ path parameter is the path of the directory to be opened. The function returns a handle to open the directory to store the current directory resources. Before opening the directory, you must first determine whether the directory exists and use the is_dir () function.

Instance:

The code is as follows: Copy code

<? Php
If (is_dir ("stufdy ")){
Opendir ("studfy ");
Print_r ("directory opened successfully ");
 }
Else
Echo "the directory does not exist ";
?>

The php pointer function rewind () can set the file position pointer to the beginning of the file. Its structure is as follows:


Bool rewind (resource $ handle );
The function returns a boolean value. If the operation succeeds, true is returned. If the operation fails, false is returned.

Instance:

The code is as follows: Copy code


<? Php
$ F = fopen ("php.txt", "r ");
Echo fgets ($ f). "<br>";/* output the first line */
Echo fgets ($ f). "<br>";/* output the second line */
Rewind ($ f);/* pointer returns the file header */
Echo fgets ($ f);/* output the first line */
?>

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.