Count the number of files per directory. Useful for hosting services that limit the number of files but not the size. Change $min_count to set the minimum number of files for a folder to be displayed.

count_files.php

<?php
    $root      = '.';
    $min_count = 1000;
    
    $iter      = new RecursiveIteratorIterator( new RecursiveDirectoryIterator( $root, RecursiveDirectoryIterator::SKIP_DOTS ), RecursiveIteratorIterator::SELF_FIRST, RecursiveIteratorIterator::CATCH_GET_CHILD );
    
    foreach ( $iter as $path => $dir ) {
        if ( $dir->isDir() ) {
            $dir_count = count_files( $path );
            if ( $dir_count > $min_count ) {
                $dir_size              = get_dir_size( $path );
                $folders[ $dir_count ] = "<tr><td>$dir_count</td><td>" . format_size( $dir_size ) . "</td><td>$path</td></tr>\n";
            }
        }
    }

    krsort( $folders );

    echo "Minimum File Count: $min_count<br>";
    echo '<table border="1"><tr><th>Count of Files</th><th>Size</th><th>Directory</th></tr>';
    foreach ( $folders as $folder ) {
        echo $folder;
    }
    echo "</table>";

    function get_dir_size( $directory ) {
        $size = 0;
        foreach ( new RecursiveIteratorIterator( new RecursiveDirectoryIterator( $directory ) ) as $file ) {
            $size += $file->getSize();
        }
        return $size;
    }

    function format_size( $size ) { //https://stackoverflow.com/posts/2510459/revisions
        if ( $size >= 1 ) {
            $si_prefix = array(
                 'B',
                'KB',
                'MB',
                'GB',
                'TB',
                'PB',
                'EB',
                'ZB',
                'YB' 
            );
            $base      = 1024;
            $class     = min( (int) log( $size, $base ), count( $si_prefix ) - 1 );
            return ( sprintf( '%1.2f', $size / pow( $base, $class ) ) . $si_prefix[ $class ] );
        } else {
            return ( 0 );
        }
    }
    
    //https://stackoverflow.com/a/41848361
    function count_files( $dirname ) {
        $path    = realpath( $dirname );
        $objects = new RecursiveIteratorIterator( new RecursiveDirectoryIterator( $path ), RecursiveIteratorIterator::SELF_FIRST );
        $count   = iterator_count( $objects );
        return ( $count );
    }
?>