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<?php $s = '401 Unauthorized : Authentication failed'; json_decode($s); var_dump(json_last_error()); // var_dump(json_last_error_msg());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/P3MYK
function name:  (null)
number of ops:  10
compiled vars:  !0 = $s
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '401+Unauthorized+%3A+Authentication+failed'
    4     1        INIT_FCALL                                               'json_decode'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    5     4        INIT_FCALL                                               'var_dump'
          5        INIT_FCALL                                               'json_last_error'
          6        DO_ICALL                                         $3      
          7        SEND_VAR                                                 $3
          8        DO_ICALL                                                 
    6     9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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