Code that outputs the 23rd to 29th characters of the file name and outputs the entire file name when there are not 7 characters

<?php

// Import all files/directories where this php file resides
$files = scandir(__DIR__);

// Take out useless things
unset($files[0]);
unset($files[1]);

// For all files/directories
foreach ($files as $file) {

    // Keep all file names separate
    $fullFileName = $file;

    // Name.If it is an extension, leave only the name part
    if (preg_match('/.*\..*/', */', $file))
        $file = preg_replace('/(.*)\..*/', */', '$1', $file);

    // If you clear the first 23 characters of the name and the rest is less than 7 characters, output the full filename
    if (strlen(substr($file, 23)) !== 7)
        echo $fullFileName."\n";
}

?>