Search file or files in folder with PHP

readme.md

"/([0-9]+)-([0-9]+)(.*)\.wav/" the regex pattern depends to your case and $matches[1] == $needle part in if block should be change to instead given pattern.

search-multiple-files.php

<?php

private function scanDir($target, $needle){
    if (file_exists($target)){
        $it = new RecursiveDirectoryIterator($target, RecursiveDirectoryIterator::SKIP_DOTS);
        $files = new RecursiveIteratorIterator($it, RecursiveIteratorIterator::CHILD_FIRST);

        $numberMatches = [];

        foreach($files as $file) {
            preg_match("/([0-9]+)-([0-9]+)(.*)\.wav/", $file, $matches);

            if ($matches && $matches[1] == $needle && file_exists($file)) {
                $numberMatches[] = $file;
            }
        }

        if (count($numberMatches)) {
            return $numberMatches;
        }
    }

    return null;
}

search-single-file-recursive.php

<?php

private function scanDir($target, $needle){
    if (file_exists($target)){
        $it = new RecursiveDirectoryIterator($target, RecursiveDirectoryIterator::SKIP_DOTS);
        $files = new RecursiveIteratorIterator($it, RecursiveIteratorIterator::CHILD_FIRST);

        foreach($files as $file) {
            preg_match("/([0-9]+)-([0-9]+)(.*)\.wav/", $file, $matches);

            if ($matches && $matches[1] == $needle && file_exists($file)) {
                return $file;
            }
        }
    }

    return null;
}

search-single-file.php

<?php

private function scanDir($target, $needle){
    if (file_exists($target)){
        $files = array_diff(scandir($dir), array('.', '..'));

        foreach($files as $file) {
            preg_match("/([0-9]+)-([0-9]+)(.*)\.wav/", $file, $matches);

            if ($matches && $matches[1] == $needle && file_exists($file)) {
                return $file;
            }
        }
    }

    return null;
}