Using PHP glob() Function to Retrieve File Paths

In PHP, the glob() function is used to obtain file paths that match a specified pattern, returning an array of matching paths.

The syntax of glob() is:

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

Parameters:

pattern : The pattern to match, supporting wildcards *, ?, and character ranges []. * matches zero or more characters, ? matches a single character.

flags : Optional flags that modify matching behavior, such as GLOB_BRACE for brace expansion.

Example – match all files in a directory: $files = glob('path/to/directory/*'); This returns an array containing all files in the specified directory.

Example – match files with a specific extension: $files = glob('path/to/directory/*.txt'); The result is an array of files ending with .txt.

Example – use brace expansion to match multiple extensions:

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

This returns an array of files with .jpg or .png extensions; the GLOB_BRACE flag enables the brace syntax.

Example – recursively match files in a directory and its sub‑directories:

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

The ** wildcard allows recursive matching, returning all files under the given path.

Additional capabilities include case‑sensitive matching and custom filters; developers can choose appropriate flags based on their needs.

Note that glob() may return both files and directories, and it returns an empty array when no matches are found, so callers should handle these cases accordingly.

Summary

The glob() function in PHP provides a flexible and powerful way to retrieve file paths matching specific patterns. By using appropriate patterns and flags, developers can quickly filter desired files, but they should be aware of case sensitivity, directory structures, and the need to handle empty results.