What functions are available in the PHP library for working with files and directories?

PHP function library provides a wealth of file and directory processing functions, including: File processing functions: reading and writing files, checking whether files exist, and deleting files. Directory processing functions: create and delete directories, scan directories, check if paths point to directories, open and read directories.

File and directory processing functions in the PHP function library

The PHP language provides a series of rich functions to operate files and Directory, making it a powerful tool for working with file systems. In this article, we will introduce the main functions in the PHP function library for file and directory processing, and demonstrate their usage through some practical cases.

File processing function

• file_get_contents(): Read the contents of the entire file and return it as a string.
• file_put_contents(): Create a new file or overwrite an existing file.
• fwrite(): Write data to an existing file.
• fread(): Read data from the file.
• file_exists(): Check whether the file exists.
• unlink(): Delete a file.

Directory processing function

• mkdir(): Create a new directory.
• rmdir(): Delete an empty directory.
• scandir(): Scans a directory and returns an array of file names containing files and subdirectories.
• is_dir(): Check whether a path points to a directory.
• opendir(): Open a directory and return a directory handle.
• readdir(): Read the name of the next file or subdirectory in the directory handle.

Practical case

Read file content:

$content = file_get_contents('myfile.txt');

Write file content:

file_put_contents('myfile.txt', 'This is a new file.');

Create directory:

mkdir('new_directory');

Scan for files and subdirectories:

$files = scandir('directory_path');

Delete files:

unlink('filename.txt');

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