Introduction and example usage of glob() function in PHP function library

PHP is a widely used programming language that can be used to develop a variety of Internet applications. The PHP function library provides many powerful functions and tools to enable developers to complete tasks more easily. One of them is the glob() function.

Theglob() function is used to find file path names matching a given pattern. It is a very useful function that allows you to quickly find multiple files or directories. In this article, we will introduce the glob() function and show some example usage.

The syntax of the glob() function is as follows:

glob(pattern, flags)

Parameters:

• pattern: Specify the pattern to match. It can be a directory name, a file name, or a file name with wildcard characters (*, ?).
• flags (optional): Used to specify other options, such as whether to search for hidden files or whether to sort.

Example 1: Find all php files in the specified directory

$files = glob('/path/to/directory/*.php');

The above code will return an array containing the paths and file names of all php files in the specified directory. Note that paths and file names are relative to the specified directory.

Example 2: Find specified files in multiple directories

$dirs = array('/path/to/directory1/', '/path/to/directory2/');
$files = array();
foreach ($dirs as $dir) {
    $files = array_merge($files, glob($dir . '*.txt'));
}

The above code will find all txt files located in two directories. First, we set up an array containing two directories. We then use a foreach loop, passing each directory along with wildcards to the glob() function to find all txt files. Finally, we use the array_merge() function to merge the arrays of files found in each directory.

Example 3: Using wildcards to find files

$files = glob('/path/to/directory/*.{php,txt}', GLOB_BRACE);

The above code will return an array containing two types of files: php files and txt files. Wildcard characters with curly braces are used to specify the file types to search for. Note that the GLOB_BRACE option enables curly brace syntax.

Example 4: Find all directories

$dirs = glob('/path/to/directory/*', GLOB_ONLYDIR);

The above code will return an array containing all directories. The GLOB_ONLYDIR option is used to match directories only.

Summary

glob() is a very practical function that can be used to find files and directories. It is important to remember that any search using wildcards will affect the performance of the function, especially in large collections of directories and files. By mastering the usage of the glob() function, you can more easily find the files you need.

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