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<?php $data = json_decode('[2000]', true, 512); var_dump($data);
based on REckp
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/cedQf
function name:  (null)
number of ops:  10
compiled vars:  !0 = $data
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'json_decode'
         1        SEND_VAL                                                 '%5B2000%5D'
         2        SEND_VAL                                                 <true>
         3        SEND_VAL                                                 512
         4        DO_ICALL                                         $1      
         5        ASSIGN                                                   !0, $1
   4     6        INIT_FCALL                                               'var_dump'
         7        SEND_VAR                                                 !0
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0