duda ForEach

[Laufwerk]

Hola amigos!
tengo una duda, y es que me gustaria que en el final no me pusiera la coma (,)
cómo puedo hacerlo?
esta es mi variable

Código:

	$ds = array(
		"id"=>array(				"name"=>"id",					"type"=>"int",						"mapping"=>"id"),
		"cif"=>array(				"name"=>"cif", 					"type"=>"string",      				"mapping"=>"cif"),
		"alias"=>array(				"name"=>"alias", 				"type"=>"string", 					"mapping"=>"alias"),
		"name"=>array(				"name"=>"name", 				"type"=>"string", 					"mapping"=>"name"),
		"address"=>array(			"name"=>"address", 				"type"=>"string",      				"mapping"=>"address"),
		"phone"=>array(				"name"=>"phone", 				"type"=>"string",      				"mapping"=>"phone"),
		"fax"=>array(				"name"=>"fax", 					"type"=>"string",      				"mapping"=>"fax"),
		"email"=>array(				"name"=>"email", 				"type"=>"string",   				"mapping"=>"email"),
		"contact"=>array(			"name"=>"contact", 				"type"=>"string",   				"mapping"=>"contact"),
		"contact_phone"=>array(		"name"=>"contact_phone", 		"type"=>"string",   				"mapping"=>"contact_phone"),
		"contact_email"=>array(		"name"=>"contact_email", 		"type"=>"string",   				"mapping"=>"contact_email"),
		"comments"=>array(			"name"=>"comments", 			"type"=>"string",   				"mapping"=>"comments"),
		"logo"=>array(				"name"=>"logo", 				"type"=>"string",   				"mapping"=>"logo")
	);

mi función:

Código:

	foreach ($ds as $key => $value ){
		$dataStore.="{";
		foreach ($value as $key2 => $value2){
			$dataStore.=$key2.": '".$value2."', ";
		}
		$dataStore.="},";
	}
	echo "<br><br><br>";
	echo $dataStore;

el codigo de arriba me devuelve este codigo

Código:

{name: 'id', type: 'int', mapping: 'id', },
{name: 'cif', type: 'string', mapping: 'cif', },
{name: 'alias', type: 'string', mapping: 'alias', },
{name: 'name', type: 'string', mapping: 'name', },
{name: 'address', type: 'string', mapping: 'address', },
{name: 'phone', type: 'string', mapping: 'phone', },
{name: 'fax', type: 'string', mapping: 'fax', },
{name: 'email', type: 'string', mapping: 'email', },
{name: 'contact', type: 'string', mapping: 'contact', },
{name: 'contact_phone', type: 'string', mapping: 'contact_phone', },
{name: 'contact_email', type: 'string', mapping: 'contact_email', },
{name: 'comments', type: 'string', mapping: 'comments', },
{name: 'logo', type: 'string', mapping: 'logo', }, 

Como podeis ver, entre ellos tengo que separarlos por (,) pero el último no,
Me podeis hechar una mano?


Gracias