Magento invoice pdf : display custom options in one line

open default.php
at path:

app/code/local/Mage/Sales/Model/Order/Pdf/Items/Invoice

//REPLACE THE LINES  one that starts with if ($options) {

        //foreach ($options as $option) { with the followin lines.

       

       $options = $this->getItemOptions();

    if ($options) {

        foreach ($options as $option) {

            if ($option['value']) {

                $_printValue = isset($option['print_value']) ? $option['print_value'] : strip_tags($option['value']);

                $values = explode(', ', $_printValue);

                foreach ($values as $value) {

                    $optlabel= Mage::helper('core/string')->str_split(strip_tags($option['label']), 70, true, true);

                    $optval = Mage::helper('core/string')->str_split($value, 50, true, true);

                    $lines[][] = array(

                        'text' => htmlspecialchars_decode ($optlabel[0]." : ".$optval[0]),

                        'feed' =>35

                    );

                }

            }

        }

    }