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<?php $input = '["\\ud55c"]'; var_dump(json_decode($input));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/tNQ0j
function name:  (null)
number of ops:  8
compiled vars:  !0 = $input
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%5B%22%5Cud55c%22%5D'
    4     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'json_decode'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $2      
          5        SEND_VAR                                                 $2
          6        DO_ICALL                                                 
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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