Дмитрий

[':id' => $articleId, ':categories' => 'categoriesProgram']

if (imagesx($img) === imagesy($img)) {
///
}

$array = [];
$dir = realpath('.'); // current directory
$fileSPLObjects = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir), RecursiveIteratorIterator::CHILD_FIRST);
foreach($fileSPLObjects as $fullFileName => $fileSPLObject) {
    if ($fileSPLObject->isFile()) {
        $info = new SplFileInfo($fullFileName);    
        if ($info->getExtension() === 'txt') {
            #$array[] = $fullFileName;  // add file in array
            // Convert here
        }
    }
}
 
#echo '<pre>' . print_r($array, true); // dump files