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<?php $arr = array(array(1,2), array(3,4,5), array(1,2,5,0)); var_dump(call_user_func_array('array_merge', $arr));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/IhGX2
function name:  (null)
number of ops:  8
compiled vars:  !0 = $arr
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        INIT_FCALL                                               'var_dump'
         2        INIT_FCALL                                               'array_merge'
         3        UNKNOWN [119]                                            !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