Snippet of code that is supposed to return generic list of items for Facebook messenger bot

gistfile1.txt

      while($result = mysqli_fetch_assoc($res)){
					$array[] = array(
			
				             "title"=> $result['title'],
				              "image_url"=> $result['img_url'],
				              "subtitle"=> "See all our colors",
				            	"buttons"=>[
						              [
						                "type"=>"postback",
							            "title"=>$result['title'],
							            "payload"=>$result['payload_id']
						              ]
				            	]
					);
						
				}
			if ($intentName == "sex"){
					$data =json_encode([
					'speech' => "Hi ".$firstname,
					'displayText' => "test",
					'source' => "source",
					'data' => ["facebook" => [
						"attachment"=>[
				       	"type"=>"template",
				      	"payload"=>[
				        "template_type"=>"generic",
				        "elements"=>[
				       	$array
			        	]
			     	 ]
			    	]	]
			    ]
					
				]);
					echo $data;	
			}

Thanks man