Illigal String Offset 'id' PHP - php

Question

RESOLVED: I WAS ADDING EXTRA INDEX TO $firms LIKE $firms['type'] = 'ABC' AS $firms Already Contains CHILD ARRAYS. My BAD, Sorry.
This might be duplicate But i couldn't figure it out T _ T Sorry
As i am printing array results coming right from database, its continuously annoying me with error
Illegal string offset 'id'
When i simply print_r result array it gives me following result.
echo "<pre>";
foreach ($firms as $firm) {
print_r($firm[0]);
}
echo "</pre>";
Result:
Array
(
[id] => 7923
[rank] => 0
[name] => CBRE
)
Array
(
[id] => 7919
[rank] => 0
[name] => Aecom
)
But if i try to print 'id' it gives me error:
echo "<pre>";
foreach ($firms as $firm) {
echo $firm[0]['id'];
}
echo "</pre>";
Error:
Illegal string offset 'id'
VAR_DUMP($firms) , Result:
array(3) {
[0]=>
array(1) {
[0]=>
array(3) {
["id"]=>
int(7923)
["rank"]=>
int(0)
["name"]=>
string(4) "CBRE"
}
}
[1]=>
array(1) {
[0]=>
array(3) {
["id"]=>
int(7919)
["rank"]=>
int(0)
["name"]=>
string(5) "Aecom"
}
}
[2]=>
array(1) {
[0]=>
array(3) {
["id"]=>
int(6793)
["rank"]=>
int(1)
["name"]=>
string(5) "AECOM"
}
}
}