3v4l.org

run code in 500+ PHP versions simultaneously
<?php var_dump(substr("test", 5)); var_dump(substr("test", -1, -5)); var_dump(substr("test", 1, -4));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/6aUKU
function name:  (null)
number of ops:  15
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                                   'var_dump'
          1        FRAMELESS_ICALL_2                substr              ~0      'test', 5
          2        SEND_VAL                                                     ~0
          3        DO_ICALL                                                     
    4     4        INIT_FCALL                                                   'var_dump'
          5        FRAMELESS_ICALL_3                substr              ~2      'test', -1
          6        OP_DATA                                                      -5
          7        SEND_VAL                                                     ~2
          8        DO_ICALL                                                     
    5     9        INIT_FCALL                                                   'var_dump'
         10        FRAMELESS_ICALL_3                substr              ~4      'test', 1
         11        OP_DATA                                                      -4
         12        SEND_VAL                                                     ~4
         13        DO_ICALL                                                     
         14      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
194.14 ms | 2718 KiB | 9 Q