http://php.net/manual/en/function.scandir.php
list all files
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<?php

  function DirLineCounter( $dir , $result = array('lines_html' => false, 'files_count' => false, 'lines_count' => false ), $complete_table = true )
  {

      $file_read = array( 'php', 'html', 'js', 'css' );
      $dir_ignore = array();
      
      $scan_result = scandir( $dir );
      
      foreach ( $scan_result as $key => $value ) {
        
          if ( !in_array( $value, array( '.', '..' ) ) ) {
            
              if ( is_dir( $dir . DIRECTORY_SEPARATOR . $value ) ) {
                
                  if ( in_array( $value, $dir_ignore ) ) {
                    continue;
                  }
                
                  $result = DirLineCounter( $dir . DIRECTORY_SEPARATOR . $value, $result, false );
                  
              }
              else {
                
              $type = explode( '.', $value ); 
              $type = array_reverse( $type );
              if( !in_array( $type[0], $file_read ) ) {
                continue;
              }
              
              $lines = 0;
              $handle = fopen( $dir . DIRECTORY_SEPARATOR . $value, 'r' );

              while ( !feof( $handle ) ) {

                  if ( is_bool( $handle ) ) {
                      break;
                  }

                  $line = fgets( $handle );
                  $lines++;
              }

              fclose( $handle );

              $result['lines_html'][] = '<tr><td>' . $dir . '</td><td>' . $value . '</td><td>' . $lines . '</td></tr>'; 
              $result['lines_count'] = $result['lines_count'] + $lines;
              $result['files_count'] = $result['files_count'] + 1;
                             
              }
          }
      }
      
      if ( $complete_table ) {
        
        $lines_html = implode('', $result['lines_html']) . '<tr><td></td><td style="border: 1px solid #222">Files Total: ' . $result['files_count'] . '</td><td style="border: 1px solid #222">Lines Total: ' . $result['lines_count'] . '</td></tr>';
        return '<table><tr><td style="width: 60%; background-color:#ddd;">Dir</td><td style="width: 30%; background-color:#ddd;">File</td><td style="width: 10%; background-color:#ddd;">Lines</td></tr>' . $lines_html . '</table>';
        
      }
      else {
        return $result;
      }
      
  }

  echo DirLineCounter( '.' );

?>