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<?php echo json_encode(['my_value' => (float) '2.19']);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/FFkL1
function name:  (null)
number of ops:  7
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'json_encode'
         1        CAST                                          5  ~0      '2.19'
         2        INIT_ARRAY                                       ~1      ~0, 'my_value'
         3        SEND_VAL                                                 ~1
         4        DO_ICALL                                         $2      
         5        ECHO                                                     $2
         6      > RETURN                                                   1

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