Setting CLASS for TR tag (HTML table body)

This is code from my project:

    foreach($res as $item){
//......
$this->table->add_row($item['price'],$celldb,$cellde, $cell1);
$this->table->add_row_class($item['center_id'].'_'.$item['spec_id']);
} 

result is:

<tbody>
<tr class="6_1">
<td>100.00</td><td>01.01.2012</td><td>00.00.0000</td></tr>
<tr class="2_4">
<td>150.00</td><td>01.04.2012</td><td>00.00.0000</td></tr>
</tbody>  

###MY_Table.php <?php if (!defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.1.6 or newer * * @package CodeIgniter * @author ExpressionEngine Dev Team * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. * @license http://codeigniter.com/user_guide/license.html * @link http://codeigniter.com * @since Version 1.3.1 * @filesource */

// ------------------------------------------------------------------------

 /**
 * HTML Table Generating Class
 *
 * Lets you create tables manually or from database result objects, or arrays.
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	HTML Tables
 * @author		Nick Gorbunov intsurfer73@gmail.com
 * @link		http://codeigniter.com/user_guide/libraries/uri.html
 */
 class MY_Table extends CI_Table {

var $row_class = array();

function add_row_class($rowclass) {
	$args = func_get_args();
	$this -> row_class[] = $this -> _prep_args($args);
}

// --------------------------------------------------------------------

/**
 * Generate the table
 *
 * @access	public
 * @param	mixed
 * @return	string
 */
function generate($table_data = NULL) {
	// The table data can optionally be passed to this function
	// either as a database result object or an array
	if (!is_null($table_data)) {
		if (is_object($table_data)) {
			$this -> _set_from_object($table_data);
		} elseif (is_array($table_data)) {
			$set_heading = (count($this -> heading) == 0 AND $this -> auto_heading ==      FALSE) ? FALSE : TRUE;
			$this -> _set_from_array($table_data, $set_heading);
		}
	}

	// Is there anything to display?  No?  Smite them!
	if (count($this -> heading) == 0 AND count($this -> rows) == 0) {
		return 'Undefined table data';
	}

	// Compile and validate the template date
	$this -> _compile_template();

	// set a custom cell manipulation function to a locally scoped variable so its callable
	$function = $this -> function;

	// Build the table!

	$out = $this -> template['table_open'];
	$out .= $this -> newline;

	// Add any caption here
	if ($this -> caption) {
		$out .= $this -> newline;
		$out .= '<caption>' . $this -> caption . '</caption>';
		$out .= $this -> newline;
	}

	// Is there a table heading to display?
	if (count($this -> heading) > 0) {
		$out .= $this -> template['thead_open'];
		$out .= $this -> newline;
		$out .= $this -> template['heading_row_start'];
		$out .= $this -> newline;

		foreach ($this->heading as $heading) {
			$temp = $this -> template['heading_cell_start'];

			foreach ($heading as $key => $val) {
				if ($key != 'data') {
					$temp = str_replace('<th', "<th $key='$val'", $temp);
				}
			}

			$out .= $temp;
			$out .= isset($heading['data']) ? $heading['data'] : '';
			$out .= $this -> template['heading_cell_end'];
		}

		$out .= $this -> template['heading_row_end'];
		$out .= $this -> newline;
		$out .= $this -> template['thead_close'];
		$out .= $this -> newline;
	}

	// Build the table rows
	if (count($this -> rows) > 0) {
		$out .= $this -> template['tbody_open'];
		$out .= $this -> newline;

		$i = 1;
		$cnt = 0;
		foreach ($this->rows as $row) {
			if (!is_array($row)) {
				break;
			}

			// We use modulus to alternate the row colors
			$name = (fmod($i++, 2)) ? '' : 'alt_';

			//nvg
			if (isset($this -> row_class[$cnt][0]['data']))
				$tr_end = ' class="' . $this -> row_class[$cnt][0]['data'] . '">';
			else
				$tr_end = '>';
			$cnt++;

			$out .= ($this -> template['row_' . $name . 'start'] . $tr_end);
			$out .= $this -> newline;

			foreach ($row as $cell) {
				$temp = $this -> template['cell_' . $name . 'start'];

				foreach ($cell as $key => $val) {
					if ($key != 'data') {
						$temp = str_replace('<td', "<td $key='$val'",      $temp);
					}
				}

				$cell = isset($cell['data']) ? $cell['data'] : '';
				$out .= $temp;

				if ($cell === "" OR $cell === NULL) {
					$out .= $this -> empty_cells;
				} else {
					if ($function !== FALSE && is_callable($function)) {
						$out .= call_user_func($function, $cell);
					} else {
						$out .= $cell;
					}
				}

				$out .= $this -> template['cell_' . $name . 'end'];
			}

			$out .= $this -> template['row_' . $name . 'end'];
			$out .= $this -> newline;
		}

		$out .= $this -> template['tbody_close'];
		$out .= $this -> newline;
	}

	$out .= $this -> template['table_close'];

	// Clear table class properties before generating the table
	$this -> clear();

	return $out;
}

function _default_template() {
	return array('table_open' => '<table border="0" cellpadding="4" cellspacing="0">',   'thead_open' => '<thead>', 'thead_close' => '</thead>', 'heading_row_start' => '<tr>', 'heading_row_end' => '</tr>', 'heading_cell_start' => '<th>', 'heading_cell_end' => '</th>', 'tbody_open' => '<tbody>', 'tbody_close' => '</tbody>', 'row_start' => '<tr', 'row_end' => '</tr>', 'cell_start' => '<td>', 'cell_end' => '</td>', 'row_alt_start' => '<tr', 'row_alt_end' => '</tr>', 'cell_alt_start' => '<td>', 'cell_alt_end' => '</td>', 'table_close' => '</table>');
}

   }

    /* End of file MY_Table.php */
    /* Location: ./application/libraries/MY_Table.php */

Addendum

This code worked for me, but when generating multiple tables, I needed to add the following method to MY_Table.php, otherwise the row classes fell out of sync with the rows:

function clear()
{
    $this->row_class       = array();
    parent::clear();
} 

Apologies if edit this page directly isn't the best way to suggest improvements, but I couldn't see a better way to do so.