MongoDb get only value but not key using php

Question

i am using mongodb and my query returns only a key value the following is the format of the var_dump

 <pre>array (size=471)
  0 => 
    array (size=1)
      'sno' => string '162230' (length=6)
  1 => 
    array (size=1)
      'sno' => string '165333' (length=6)
  2 => 
    array (size=1)
      'sno' => string '181312' (length=6)
  3 => 
    array (size=1)
      'sno' => string '181313' (length=6)
  4 => 
    array (size=1)
      'sno' => string '181314' (length=6)
  5 => 
    array (size=1)
      'sno' => string '181315' (length=6)
  6 => 
    array (size=1)
      'sno' => string '181316' (length=6)
  7 => 
    array (size=1)
      'sno' => string '181317' (length=6)
  8 => 
    array (size=1)
      'sno' => string '181318' (length=6)
  9 => 
    array (size=1)
      'sno' => string '181319' (length=6)
  10 => 
    array (size=1)
      'sno' => string '181320' (length=6)</pre>

I do not want key . all i want is a array of values without a loop.

Answer 1

Solved it.

 array_column($arr,"sno")