How to use functions in PHP directory

This article mainly shares with you how to use the functions of the PHP directory. I hope it can help you.

Create directory

1. mkdir: Try to create a new directory specified by pathname.

bool mkdir ( string $pathname [, int $mode = 0777 [, bool $recursive = false [, resource $context ]]] )

• Recursive creation is not supported by default:

• The third parameter Write true:

Tip: The second one is ignored in Windows, but it is useful in Linux!

Delete directory

2. rmdir: Try to delete the directory specified by dirname. The directory must be empty and must have appropriate permissions. Failure will generate an E_WARNING level error.

bool rmdir ( string $dirname [, resource $context ] )

Tip: Deletion of non-empty directories is not allowed

Get directory contents

opendir: Open a directory handle, which can be used for subsequent closedir(), readdir() and rewinddir () is calling.

resource opendir ( string $path [, resource $context ] )

Return value: Returns the resource of the directory handle if successful, returns FALSE if failed.

readdir: Returns the file name of the next file in the directory. File names are returned in order in the file system.

string readdir ([ resource $dir_handle ] )

Parameters$dir_handle: The resource of the directory handle, previously opened by opendir()

Return value: Returns the file name on success or returns on failure FALSE

• Through the handle, read a file (including files and subdirectories) from the directory, read one file at a time, and move the file pointer downward!

• Note that there are ., .. virtual directories under each directory. Represents the current directory and the superior directory.

With the loop structure, you can get all the contents in the directory:

Usually ignore . and ..

#0 file names may be treated as false, so you need to use the inequality comparison operator

closedir: Close the directory stream specified by dir_handle. The stream must have been previously opened by opendir().

void closedir ([ resource $dir_handle ] )

rename: Rename (move) a file or directory, rename oldname to newname.

bool rename ( string $oldname , string $newname [, resource $context ] )

Create directory

1. mkdir: Try to create a new directory specified by pathname.

bool mkdir ( string $pathname [, int $mode = 0777 [, bool $recursive = false [, resource $context ]]] )

• Recursive creation is not supported by default:

• The third parameter Write true:

Tip: The second one is ignored in Windows, but it is useful in Linux!

Delete directory

2. rmdir: Try to delete the directory specified by dirname. The directory must be empty and have appropriate permissions. Failure will generate an E_WARNING level error.

bool rmdir ( string $dirname [, resource $context ] )

Tip: Deletion of non-empty directories is not allowed

Get directory content

opendir: open a directory handle, which can be used for subsequent closedir(), readdir() and rewinddir () is calling.

resource opendir ( string $path [, resource $context ] )

Return value: Returns the resource of the directory handle if successful, returns FALSE if failed.

readdir: Returns the file name of the next file in the directory. File names are returned in order in the file system.

string readdir ([ resource $dir_handle ] )

Parameters$dir_handle: The resource of the directory handle, previously opened by opendir()

Return value: Returns the file name on success or returns on failure FALSE

• #Read a file (including files and subdirectories) from the directory through the handle, read one file at a time, and move the file pointer downward!

• Note that there are ., .. virtual directories under each directory. Represents the current directory and the superior directory.

With the loop structure, you can get all the contents in the directory:

通常要忽略. 和 ..

0文件名可能被当作false 处理，所以需要使用全不等比较运算符处理

closedir ：关闭由 dir_handle 指定的目录流。流必须之前被 opendir() 所打开。

void closedir ([ resource $dir_handle ] )

rename ：重命名（移动）一个文件或目录，把 oldname 重命名为 newname。

bool rename ( string $oldname , string $newname [, resource $context ] )

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