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<?php echo chr(ord('A')-1);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/0036V
function name:  (null)
number of ops:  9
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'chr'
         1        INIT_FCALL                                               'ord'
         2        SEND_VAL                                                 'A'
         3        DO_ICALL                                         $0      
         4        SUB                                              ~1      $0, 1
         5        SEND_VAL                                                 ~1
         6        DO_ICALL                                         $2      
         7        ECHO                                                     $2
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0