Master PHP’s glob() Function: Find Files and Directories Efficiently

PHP is a widely used language for building web applications, and its standard library includes powerful functions such as glob(), which searches for file pathnames matching a given pattern.

Parameters

pattern

: The pattern to match, which can include directory names, file names, or wildcards like * and ?. flags (optional): Additional options such as searching hidden files or sorting results.

Example 1: Find all PHP files in a specific directory

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

This returns an array of full paths for every .php file in the specified folder.

Example 2: Find specific files across multiple directories

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

The code builds an array of .txt files from both directories by iterating with foreach and merging the results.

Example 3: Use brace expansion to match multiple extensions

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

This returns both .php and .txt files; the GLOB_BRACE flag enables the brace syntax.

Example 4: Retrieve only directories

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

The GLOB_ONLYDIR flag restricts matches to directories, returning an array of sub‑folder paths.

Conclusion

The glob() function is a practical tool for locating files and directories, but be aware that wildcard searches can impact performance on large file systems. Mastering its usage allows developers to efficiently locate the resources they need.