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<?php echo json_encode(array(1=>2,3=>'4'),JSON_NUMERIC_CHECK); echo json_encode(array(1=>2,3=>'4'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/BNHC9
function name:  (null)
number of ops:  10
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'json_encode'
         1        SEND_VAL                                                 <array>
         2        SEND_VAL                                                 32
         3        DO_ICALL                                         $0      
         4        ASSIGN_OBJ                                               $0
   3     5        INIT_FCALL                                               'json_encode'
         6        SEND_VAL                                                 <array>
         7        DO_ICALL                                         $1      
         8        ASSIGN_OBJ                                               $1
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0