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<?php echo substr('3M', -1, 1); echo substr('154B', -1, 1);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/6XkQk
function name:  (null)
number of ops:  13
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'substr'
          1        SEND_VAL                                                 '3M'
          2        SEND_VAL                                                 -1
          3        SEND_VAL                                                 1
          4        DO_ICALL                                         $0      
          5        ECHO                                                     $0
    4     6        INIT_FCALL                                               'substr'
          7        SEND_VAL                                                 '154B'
          8        SEND_VAL                                                 -1
          9        SEND_VAL                                                 1
         10        DO_ICALL                                         $1      
         11        ECHO                                                     $1
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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163.18 ms | 1394 KiB | 15 Q