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<?php var_dump(json_encode("{a: 1.3320000}"));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/dkH64
function name:  (null)
number of ops:  7
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'json_encode'
         2        SEND_VAL                                                 '%7Ba%3A+1.3320000%7D'
         3        DO_ICALL                                         $0      
         4        SEND_VAR                                                 $0
         5        DO_ICALL                                                 
         6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0