PHP Mongodb find() not working as expected

Question

I got a very basic Mongodb Find request which seems not to work. php 7+ I want something like in SQL: where 'common' LIKE %Burk%

The simple query is to call the countries collection and produce Burkina Faso as output

QUERY 1:

$countries_tb= $db->selectCollection('country_city_data');
 $countries = $countries_tb->find([],[
    'common' => new MongoDB\BSON\Regex('Burk')]);
var_dump($countries);

the var_dump prints everything in the database

QUERY 2:

when I do find(without the empty []), it var_dumps nothing necessary

 $countries = $countries_tb->find(/*without the []*/ [
    'common' => new MongoDB\BSON\Regex('Burk')]);

var_dump($countries);

I get this:

I have also tried this format.

QUERY 3:

 $countries = $countries_tb->find(
                     array('name'=>
 array(  'common'=>new MongoDB\BSON\Regex('Burk'))));

                var_dump($countries);

Still no success.

As suggested by @noobProgrammer below, doing like this:

 $countries_tb->find(['name' => 
                  ['common'=>new MongoDB\BSON\Regex('Burk')]], 
                  ['typeMap' => ['root' => 'array', 'document' => 'array']]);

Produces this;

instead of the word 'Burkina Faso'

Still NO Success

Answer 1

I got it working finally!

This is what I did.

$countries = $countries_tb->find(array('name.common' =>   array('$regex' =>  'Burk') ) );

Notice the . in name.common

Here is my foreach loop'

foreach( $countries as $country => $name) { 

   foreach ($name as $n){

       if(isset($n->common)){

            var_dump($n->common);

        }

   }
}

//It prints out:    country_cities.php:90:string 'Burkina Faso' (length=12)

---

Somehow, this does NOT work

$countries = $countries_tb->find(
                         array('name'=>
                                 array('common' =>   
                                         array('$regex' =>   'Burk')) ) );

This is the JSON'

{"_id":"55a0f42f20a4d760b5fc306d","altSpellings":["BF"],"area":272967,"borders":["BEN","CIV","GHA","MLI","NER","TGO"],"callingCode":["226"],"capital":"Ouagadougou","cca2":"BF","cca3":"BFA","ccn3":"854","cioc":"BUR","currency":["XOF"],"demonym":"Burkinabe","landlocked":true,"languages":{"fra":"French"},"latlng":[13,-2],"name":{"common":"Burkina Faso","native":{"fra":{"common":"Burkina Faso","official":"Burkina Faso"}},"official":"Burkina Faso"},"region":"Africa","subregion":"Western Africa","tld":[".bf"],"translations":{"cym":{"common":"Burkina Faso","official":"Burkina Faso"},"deu":{"common":"Burkina Faso","official":"Burkina Faso"},"fin":{"common":"Burkina Faso","official":"Burkina Faso"},"fra":{"common":"Burkina Faso","official":"Burkina Faso"},"hrv":{"common":"Burkina Faso","official":"Burkina Faso"},"ita":{"common":"Burkina Faso","official":"Burkina Faso"},"jpn":{"common":"ブルキナファソ","official":"ブルキナファソ"},"nld":{"common":"Burkina Faso","official":"Burkina Faso"},"por":{"common":"Burkina Faso","official":"Burkina Faso"},"rus":{"common":"Буркина-Фасо","official":"Буркина -Фасо"},"spa":{"common":"Burkina Faso","official":"Burkina Faso"}}}

Answer 2

All filters should be in the first array parameter

$countries_tb->find(['area' => 272967, 'capital' => 'Ouagadougou'] , options );

The second param is for options. You should pass typeMap as an option to convert the object to an array

$options = ['typeMap' => ['root' => 'array', 'document' => 'array']] ;