Recursively sort files

<?php

$minute = 5;
ini_set('memory_limit', '-1');
ini_set('max_execution_time', (60 * $minute)); // 60 (seconds) = 1 Minutes

/**
 * Recursive listing files
 *
 * @param string $directory
 * @param array $entries_array optional
 * @return array of files
 */
function recursiveScan($directory, &$entries_array = array())
{
    if (is_dir($directory) && is_readable($directory) && !is_link($directory)) { // link can cause endless loop
        $handle = @opendir($directory);
        if ($handle) {
            while (($entry = readdir($handle)) !== false) {
                if ($entry == '.' || $entry == '..') {
                    continue;
                }
                $entry = $directory . DIRECTORY_SEPARATOR . $entry;
                if (is_dir($entry)) {
                    $entries_array = recursiveScan($entry, $entries_array);
                } elseif (is_writable($entry)) {
                    $entries_array['file_writable'][] = $entry;
                } else {
                    $entries_array['file_not_writable'][] = $entry;
                }
            }
            closedir($handle);
        }
    }
    return $entries_array;
}
/**
 *
 * Sort array of list file by lastest modified time
 *
 * @param array  $files Array of files
 *
 * @return array
 *
 */
function sortByLastModified($files)
{
    @array_multisort(array_map('filemtime', $files), SORT_DESC, $files);
    return $files;
}
/**
 *
 * Recurisively list a file by descending modified time
 *
 * @param string $path
 *
 * @return array
 *
 */
function getSortedByTime($path)
{
    $result = recursiveScan($path);
    $fileWritable = $result['file_writable'];
    $fileNotWritable = $result['file_not_writable'];
    $fileWritable = sortByLastModified($fileWritable);

    return [
        'file_writable' => $fileWritable,
        'file_not_writable' => $fileNotWritable
    ];
}
/**
 * Recurisively list a file by array of extension
 *
 * @param string $path
 * @param array $ext
 * @return array of files
 */
function getSortedByExtension($path, $ext)
{
    $result = getSortedByTime($path);
    $fileWritable = $result['file_writable'];
    $fileNotWritable = $result['file_not_writable'];

    foreach($fileWritable as $entry) {
        $pathinfo = pathinfo($entry, PATHINFO_EXTENSION);
        $pathinfo = strtolower($pathinfo);

        if(in_array($pathinfo, $ext)) {
            $sortedWritableFile[] = $entry;
        }
    }
    foreach($fileNotWritable as $entry) {
        $pathinfo = pathinfo($entry, PATHINFO_EXTENSION);
        $pathinfo = strtolower($pathinfo);

        if(in_array($pathinfo, $ext)) {
            $sortedNotWritableFile[] = $entry;
        }
    }

    return [
        'file_writable' => $sortedWritableFile,
        'file_not_writable' => $sortedNotWritableFile
    ];
}
// test
$result = getSortedByExtension(getcwd(), ['php','phtml']);

$fileWritable = $result['file_writable'];
$fileNotWritable = $result['file_not_writable'];
$fileWritable = sortByLastModified($fileWritable);

foreach ($fileWritable as $file) {
    echo $file, '<br/>';
}
echo 'take a look', '<br/>';

foreach ($fileNotWritable as $file) {
    echo $file, '<br/>';
}