How to Find Files in Subfolders with PHP: `glob()` vs. `RecursiveDirectoryIterator`?

How to Search for Files in Subfolders Using PHP glob()

To search for files in subfolders using PHP's glob() function, consider the following approaches:

Recursive Search with glob()

Utilize the glob() function with recursive traversal:

function rglob($pattern, $flags = 0) {
    $files = glob($pattern, $flags); 
    foreach (glob(dirname($pattern).'/*', GLOB_ONLYDIR|GLOB_NOSORT) as $dir) {
        $files = array_merge(
            [],
            ...[$files, rglob($dir . "/" . basename($pattern), $flags)]
        );
    }
    return $files;
}

Example:

$result = rglob($_SERVER['DOCUMENT_ROOT'] . '/test.zip');

Recursive Iteration with RecursiveDirectoryIterator

Alternatively, employ RecursiveDirectoryIterator with regular expression matching:

function rsearch($folder, $regPattern) {
    $dir = new RecursiveDirectoryIterator($folder);
    $ite = new RecursiveIteratorIterator($dir);
    $files = new RegexIterator($ite, $regPattern, RegexIterator::GET_MATCH);
    $fileList = array();
    foreach($files as $file) {
        $fileList = array_merge($fileList, $file);
    }
    return $fileList;
}

Example:

$result = rsearch($_SERVER['DOCUMENT_ROOT'], '/.*\/test\.zip/');

Note that RecursiveDirectoryIterator is available in PHP5, while glob() has been present since PHP4. Both methods effectively search for files within subdirectories.

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