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<?php $a=array("m"=>10,"sm"=>20,"xl"=>30,"xxl"=>10); $b=json_encode($a); echo $b; var_dump(json_decode($b));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/NhL10
function name:  (null)
number of ops:  13
compiled vars:  !0 = $a, !1 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, <array>
   3     1        INIT_FCALL                                               'json_encode'
         2        SEND_VAR                                                 !0
         3        DO_ICALL                                         $3      
         4        ASSIGN                                                   !1, $3
   4     5        ECHO                                                     !1
   5     6        INIT_FCALL                                               'var_dump'
         7        INIT_FCALL                                               'json_decode'
         8        SEND_VAR                                                 !1
         9        DO_ICALL                                         $5      
        10        SEND_VAR                                                 $5
        11        DO_ICALL                                                 
        12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0