Add Attribute (DropDown) Value in magento via csv

update_attribute_options.php

<?php
/**
 * Add Attribute (DropDown) Options Value in magento via csv (http://prntscr.com/7wimts)
 * CSV first column will have the values to import.
 * @author Vikramjeet Thakur <[email protected]>
 *
 */


ini_set('max_execution_time', 0);
require_once 'app/Mage.php';
umask(0);
Mage::app();


function setOrAddOptionAttribute($arg_attribute, $arg_value) {
    $attribute_model = Mage::getModel('catalog/resource_eav_attribute');
    $attribute_options_model = Mage::getModel('eav/entity_attribute_source_table');

    $attribute_code = $attribute_model->getIdByCode('catalog_product', $arg_attribute);
    $attribute = $attribute_model->load($attribute_code);

    $attribute_options_model->setAttribute($attribute);
    $options = $attribute_options_model->getAllOptions(false);

    // determine if this option exists
    $value_exists = false;
    foreach($options as $option) {
        if ($option['label'] == $arg_value) {
            $value_exists = true;
            break;
        }
    }

    // if this option does not exist, add it.
    if (!$value_exists) {
        $attribute->setData('option', array(
            'value' => array(
                'option' => array($arg_value,$arg_value)
            )
        ));
        $attribute->save();
    }
}


$fileo = "trim.csv"; // filename and location

if (($handle = fopen($fileo, "r")) !== FALSE) {

    while (($data = fgetcsv($handle, 1024, ",")) !== FALSE) {
        try{
            setOrAddOptionAttribute('trim', $data[0]);
            echo $data[0]."\r \n";

        }catch(Exception $e){
            //Mage::log($e->getMessage(), null, 'Failure.log'); // optional for magento logging
            echo $e->getMessage();
        }
    }
}

fclose($newhandle);
?>