Database-PHP reads and writes MongoDB, and shell reads and writes MongoDB. How are data still isolated from each other? -Php tutorial

Start the mongod server first, and open a shell client: usehahadb. haha. insert ({& #039; a & #039;: & #039; aaa & #039;}) db. haha. find () {& #039; a & #039;: & #039; aaa & #039;} added successfully to open another shell client: usehahadb. haha. find () confirm the input {& #039; a & #039 ;:& #039 ;... start the mongod server first;
Open a shell client:

Use haha
Db. haha. insert ({'A': 'aaa '})
Db. haha. find ()
{'A': 'aaa '}// Added successfully

Open another shell client:

Use haha
Db. haha. find () // confirm the input.
{'A': 'aaa '}// Valid indeed

It can be seen that the shell client has an effect.
The following is the php code:

$ M = new clients client ();
$ Jihe = $ m-> db-> haha;

$ Cursor = $ jihe-> find ();
Foreach ($ cursor as $ item ){
Var_dump ($ item); // nothing, empty data
}

Then modify the php code:

$ M = new clients client ();
$ Jihe = $ m-> db-> haha;

$ Doc = array ('B' => 'bbb ');
$ Jihe-> insert ($ doc );// Php tries to insert data.

$ Cursor = $ jihe-> find ();
Foreach ($ cursor as $ item ){
Var_dump ($ item); // this time only{'B': 'bbb '}Data, not set in shell{'A': 'aaa '}
}

What's going on? All operations initiated for the same database. How is the difference between shell client access and php access?

Reply content:

Start the mongod server first;
Open a shell client:

Use haha
Db. haha. insert ({'A': 'aaa '})
Db. haha. find ()
{'A': 'aaa '}// Added successfully

Open another shell client:

Use haha
Db. haha. find () // confirm the input.
{'A': 'aaa '}// Valid indeed

It can be seen that the shell client has an effect.
The following is the php code:

$ M = new clients client ();
$ Jihe = $ m-> db-> haha;

$ Cursor = $ jihe-> find ();
Foreach ($ cursor as $ item ){
Var_dump ($ item); // nothing, empty data
}

Then modify the php code:

$ M = new clients client ();
$ Jihe = $ m-> db-> haha;

$ Doc = array ('B' => 'bbb ');
$ Jihe-> insert ($ doc );// Php tries to insert data.

$ Cursor = $ jihe-> find ();
Foreach ($ cursor as $ item ){
Var_dump ($ item); // this time only{'B': 'bbb '}Data, not set in shell{'A': 'aaa '}
}

What's going on? All operations initiated for the same database. How is the difference between shell client access and php access?

Speculation: shell is connectedhahaPhp is connecteddbThis is Two database spaces.
Open a shell client and enter the command

show dbs

Besides haha, is there a db? If Yes

$jihe = $m->db->haha;

Should be changed

$jihe = $m->haha->haha;

If it is No, (vendors) php has not been touched for many years.

Make sure you are connected to the same server and database