magento_soap_catalog_product_create_simple.php

<?php
$proxy->call($sessionId, 'catalog_product.create', array(
	'simple',
	'4', // setId
	'simple_sku_yellow_XL',
	array(
		'name'                  => 'Product name',
		'description'           => 'Description Text...',
		'short_description'     => 'Short Description Text...',
		'websites'              => array(1),
		'price'                 => 100.00,
		'color'                 => $color,
		'size'                  => $size,
		'visibility'            => 1,
 )
);