Home Backend Development PHP Tutorial PHP的目录管理函数_PHP

PHP的目录管理函数_PHP

Jun 01, 2016 pm 12:32 PM
e content function document Table of contents type manage return

chdir : 改变目录。
dir : 目录类别类。
closedir : 关闭目录 handle。
opendir : 打开目录 handle。
readdir : 读取目录 handle。
rewinddir : 重设目录 handle。

chdir
改变目录。
语法: int chdir(string directory);
返回值: 整数
函数种类: 文件存取
内容说明 本函数用来改变目前 PHP 执行的目录到新的 directory 目录中。若无法改变则返回 false,成功则返回 true。

dir
目录类别类。
语法: new dir(string directory);
返回值: 类
函数种类: 文件存取
内容说明 这是一个类似面向对象的类别类,用来读取目录。当目录参数 directory 打开之后,有二个属性可用:handle 属性就像其它非类的函数所用的 readdir()、rewinddir() 及 closedir();path 属性则配置打开目录后的路径参数。本类有三个方法 (method):read、rewind 与 close。

使用范例

$d = dir("/etc");
echo "Handle: ".$d->handle."
\n";
echo "Path: ".$d->path."
\n";
while($entry=$d->read()) {
echo $entry."
\n";
}
$d->close();
?>

closedir
关闭目录 handle。
语法: void closedir(int dir_handle);
返回值: 无
函数种类: 文件存取
内容说明
本函数用来关闭目录资料流的 dir_handle。这个 dir_handle 参数所操作的目录必须要 opendir() 打开的方可使用。

opendir
打开目录 handle。
语法: int opendir(string path);
返回值: 整数
函数种类: 文件存取
内容说明
本函数用来打开目录资料流。返回的整数是可供其它目录函数操作的 handle。

readdir
读取目录 handle。
语法: string readdir(int dir_handle);
返回值: 字符串
函数种类: 文件存取
内容说明 本函数用来读取目录。返回目录中的文件名称,读取不照任何特殊的顺序。
使用范例 本例列出目前目录的所有文件
$handle=opendir('.');
echo "目录 handle: $handle\n";
echo "文件:\n";
while ($file = readdir($handle)) {
echo "$file\n";
}
closedir($handle);
?>

rewinddir
重设目录 handle。
语法: void rewinddir(int dir_handle);
返回值: 无
函数种类: 文件存取
内容说明 本函数用来重设目录资料流到开始处。

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Tips for dynamically creating new functions in golang functions Tips for dynamically creating new functions in golang functions Apr 25, 2024 pm 02:39 PM

Go language provides two dynamic function creation technologies: closure and reflection. closures allow access to variables within the closure scope, and reflection can create new functions using the FuncOf function. These technologies are useful in customizing HTTP routers, implementing highly customizable systems, and building pluggable components.

Considerations for parameter order in C++ function naming Considerations for parameter order in C++ function naming Apr 24, 2024 pm 04:21 PM

In C++ function naming, it is crucial to consider parameter order to improve readability, reduce errors, and facilitate refactoring. Common parameter order conventions include: action-object, object-action, semantic meaning, and standard library compliance. The optimal order depends on the purpose of the function, parameter types, potential confusion, and language conventions.

How to write efficient and maintainable functions in Java? How to write efficient and maintainable functions in Java? Apr 24, 2024 am 11:33 AM

The key to writing efficient and maintainable Java functions is: keep it simple. Use meaningful naming. Handle special situations. Use appropriate visibility.

Complete collection of excel function formulas Complete collection of excel function formulas May 07, 2024 pm 12:04 PM

1. The SUM function is used to sum the numbers in a column or a group of cells, for example: =SUM(A1:J10). 2. The AVERAGE function is used to calculate the average of the numbers in a column or a group of cells, for example: =AVERAGE(A1:A10). 3. COUNT function, used to count the number of numbers or text in a column or a group of cells, for example: =COUNT(A1:A10) 4. IF function, used to make logical judgments based on specified conditions and return the corresponding result.

Comparison of the advantages and disadvantages of C++ function default parameters and variable parameters Comparison of the advantages and disadvantages of C++ function default parameters and variable parameters Apr 21, 2024 am 10:21 AM

The advantages of default parameters in C++ functions include simplifying calls, enhancing readability, and avoiding errors. The disadvantages are limited flexibility and naming restrictions. Advantages of variadic parameters include unlimited flexibility and dynamic binding. Disadvantages include greater complexity, implicit type conversions, and difficulty in debugging.

What are the benefits of C++ functions returning reference types? What are the benefits of C++ functions returning reference types? Apr 20, 2024 pm 09:12 PM

The benefits of functions returning reference types in C++ include: Performance improvements: Passing by reference avoids object copying, thus saving memory and time. Direct modification: The caller can directly modify the returned reference object without reassigning it. Code simplicity: Passing by reference simplifies the code and requires no additional assignment operations.

What is the difference between custom PHP functions and predefined functions? What is the difference between custom PHP functions and predefined functions? Apr 22, 2024 pm 02:21 PM

The difference between custom PHP functions and predefined functions is: Scope: Custom functions are limited to the scope of their definition, while predefined functions are accessible throughout the script. How to define: Custom functions are defined using the function keyword, while predefined functions are defined by the PHP kernel. Parameter passing: Custom functions receive parameters, while predefined functions may not require parameters. Extensibility: Custom functions can be created as needed, while predefined functions are built-in and cannot be modified.

C++ Function Exception Advanced: Customized Error Handling C++ Function Exception Advanced: Customized Error Handling May 01, 2024 pm 06:39 PM

Exception handling in C++ can be enhanced through custom exception classes that provide specific error messages, contextual information, and perform custom actions based on the error type. Define an exception class inherited from std::exception to provide specific error information. Use the throw keyword to throw a custom exception. Use dynamic_cast in a try-catch block to convert the caught exception to a custom exception type. In the actual case, the open_file function throws a FileNotFoundException exception. Catching and handling the exception can provide a more specific error message.

See all articles