_blockHeader example

if (is_array($block)) {
            $output .= $this->_block($x0$xi - $x0,
                                     $y0$yi - $y0,
                                     $block);
        }

        return $output . $this->_endDiff();
    }

    function _block($xbeg$xlen$ybeg$ylen, &$edits)
    {
        $output = $this->_startBlock($this->_blockHeader($xbeg$xlen$ybeg$ylen));

        foreach ($edits as $edit) {
            switch (strtolower(get_class($edit))) {
            case 'text_diff_op_copy':
                $output .= $this->_context($edit->orig);
                break;

            case 'text_diff_op_add':
                $output .= $this->_added($edit->final);
                break;

            
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