For this you can create your php script, create one php file on root directory of your website and use following code.for ex: if file name is exportCustomer.php
and your url is like http://magentowebsite.com then after placing this file in root you need to visit url like http://magentowebsite.com/exportCustomer.php then you will get a csv in your root directory with name as customers.csv
<?php
require_once('app/Mage.php');
umask(0);
if (!Mage::isInstalled()) {
echo "Application is not installed yet, please complete install wizard first.";
exit;
}
// Only for urls // Don't remove this
$_SERVER['SCRIPT_NAME'] = str_replace(basename(__FILE__), 'index.php', $_SERVER['SCRIPT_NAME']);
$_SERVER['SCRIPT_FILENAME'] = str_replace(basename(__FILE__), 'index.php', $_SERVER['SCRIPT_FILENAME']);
Mage::app('admin')->setUseSessionInUrl(false);
Mage::setIsDeveloperMode(true); ini_set('display_errors', 1); error_reporting(E_ALL);
try {
Mage::getConfig()->init();
Mage::app();
} catch (Exception $e) {
Mage::printException($e);
}
ini_set('memory_limit','500M');
$customerCount = 0;
try{
//configure the collection filters.
$collection = Mage::getResourceModel('customer/customer_collection')
->addAttributeToSelect('firstname')
->addAttributeToSelect('lastname')
->addAttributeToSelect('email')
->addAttributeToSelect('store_id');
//Add a page size to the result set.
$collection->setPageSize(50);
//discover how many page the result will be.
$pages = $collection->getLastPageNumber();
$currentPage = 1;
//This is the file to append the output to.
$fp = fopen('customers.csv', 'w');
$addedKeys = false;
do{
//Tell the collection which page to load.
$collection->setCurPage($currentPage);
$collection->load();
foreach ($collection as $customer){
//write the collection array as a CSV.
$customerArray = $customer->toArray();
$customerREquiredArray['First name'] = $customerArray['firstname'];
$customerREquiredArray['Last name'] = $customerArray['lastname'];
$customerREquiredArray['Email'] = $customerArray['email'];
$customerREquiredArray['Store ID'] = $customerArray['store_id'];
if($addedKeys == false){
$keys = array_keys($customerREquiredArray);
fputcsv($fp, $keys);
$addedKeys = true;
}
//var_dump($customerArray); echo "\n\n";
fputcsv($fp, $customerREquiredArray);
//fwrite($fp,print_r($customerArray,true) . chr(10) );
$customerCount++;
}
$currentPage++;
//make the collection unload the data in memory so it will pick up the next page when load() is called.
$collection->clear();
//break; //DEBUG
echo "Finished page $currentPage of $pages \n";
} while ($currentPage <= $pages);
fclose($fp);
} catch (Exception $e) {
//$response['error'] = $e->getMessage();
Mage::printException($e);
}
echo "Saved $customerCount customers to csv file \n";
Hope this will help you.