Master PHP’s glob() Function: Patterns, Flags, and Real‑World Examples

Overview

In PHP, the glob() function retrieves an array of file paths that match a given pattern. It is useful for quickly locating files based on wildcard patterns.

Syntax

array glob ( string $pattern [, int $flags = 0 ] )

Parameters

pattern : The pattern to match. Supports wildcards * (zero or more characters), ? (single character), and character ranges [].

flags : Optional integer that modifies matching behavior (e.g., GLOB_BRACE, GLOB_ONLYDIR, etc.).

Common Use Cases

Match all files in a directory

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

Match files with a specific extension

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

Match multiple extensions using GLOB_BRACE

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

Recursive matching of a directory tree

$files = glob('path/to/directory/**/*', GLOB_BRACE);

Important Considerations

The function returns both files and directories that match the pattern.

If no matches are found, glob() returns an empty array.

Be aware of case‑sensitivity and directory depth; use appropriate flags or additional filtering when needed.

Conclusion

The glob() function is a flexible tool for file system operations in PHP. By choosing suitable patterns and flags, developers can efficiently locate and process files, while handling edge cases such as empty results or case‑sensitive matches.