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<?php $x = [ 'foo' => [], 'biz' => [ 'baz' => [] ] ]; var_dump(array_flatten($x));
based on 4MPEb
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/C03dq
function name:  (null)
number of ops:  8
compiled vars:  !0 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   8     1        INIT_FCALL                                               'var_dump'
         2        INIT_FCALL_BY_NAME                                       'array_flatten'
         3        SEND_VAR_EX                                              !0
         4        DO_FCALL                                      0  $2      
         5        SEND_VAR                                                 $2
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0