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<?php $tmp = array('a' => 'b', 'b' => 'c'); serialize($tmp);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/Br1SI
function name:  (null)
number of ops:  5
compiled vars:  !0 = $tmp
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, <array>
   3     1        INIT_FCALL                                               'serialize'
         2        SEND_VAR                                                 !0
         3        DO_ICALL                                                 
         4      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0