Append new value to array column

Question

How can I insert a new value in MongoDb Column Array?

 // Connect Collection
 $collection = $this->mongo_db->db->selectCollection('test');

 // Remove All Document
 $collection->remove();
 // initially Insert abcd Column inside Firstnam Lastname Value
 $test=array('abcd'=>
 array("firstname" => "Bob", "lastname" => "Jones" )
 );

 // Insert Value
 $content=$collection->insert($test);

 // get Last Insert ID
 $newDocID = $test['_id'];

 // Append New value in above abcd Array Field Column
 $newdata = array('$set'=>
 array('abcd'=> array('city'=>"Tiruppur"))
 );

 $collection->update(array("_id" => new MongoId($newDocID)), $newdata);
 

 // Current Result
 {
 "_id" : ObjectId("55995b0be5ffc4980b000041"),
 "abcd" : {
 "city" : "Tiruppur"
 }
 }

 // But Need Expect Result

 {
 "_id" : ObjectId("55995b0be5ffc4980b000041"),
 "abcd" : {
 "firstname" => "Bob",
 "lastname" => "Jones" ,
 "city" : "Tiruppur"
 }
 }

 // Please be help to Find Solution
 

Answer 1

Use dot notation:

$newdata = array('$set' => array('abcd.city' => "Tiruppur"));

• user1837631: Thank You for u r response TECHWISDOM, But This Ans is Wrong, i am Already try this Code, But Got Error : The field 'abcd' must be an array but is of type Object in document {_id: ObjectId('559aa69ee5ffc4680c000043')} error code: 16837
• TechWisdom: @user1837631, I see. Check out my edited answer and tell me what is going on please.
• TechWisdom: @user1837631, You are welcome my friend. I'll be glad if you could mark this as the answer (the V at the left). Thanks.