woocommerce.php

<?php 
/*
 * Changing WooCommerce City field to dropdown with predifned cities.
 * Based on https://docs.woocommerce.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/
 */ 


function elicohenator_override_checkout_fields( $fields ) {

	// Create args for city fields - same for shipping & billing
	$city_args = wp_parse_args( array(
		'type' => 'select',
		'options' => array(
			'tel-aviv-yaffo' => __('Tel Aviv Yaffo', 'domainname'),
			'givatayim' => __('Givatayim', 'domainname'),
			'ramat-gan' => __('Ramat Gan', 'domainname'),
			'bat-yam' => __('Bat Yam', 'domainname'),
			'holon' => __('Holon', 'domainname'),
			'rishon-leziyon' => __('Rishon Leziyon', 'domainname'),
			'herzliya' => __('Herzliya', 'domainname'),
			'ramat-hasharon' => __('Ramat Hasharon', 'domainname'),
			'hod-hasharon' => __('Hod Hasharon', 'domainname'),
			'petah-tikwa' => __('Petah Tikwa', 'domainname'),
			'raanana' => __('Raanana', 'domainname'),
			'kfar-saba' => __('Kfar Saba', 'domainname'),
			// Add as much as you wish...
		),
	), $fields['shipping']['shipping_city'] );

	// applying args to shipping & billing fields
	$fields['shipping']['shipping_city'] = $city_args;
	$fields['billing']['billing_city'] = $city_args;
	
	// return with all form fields
	return $fields;
}
add_filter( 'woocommerce_checkout_fields' , 'elicohenator_override_checkout_fields' );