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You really shouldn't store a list of products in a single database column. It's best to have a row for each product and have them relate back to another table. But if you must:
mysql_function(): WARNING: This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQLextension should be used. See also MySQL: choosing an API guide and related FAQ for more information.