3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo substr('abcdef', -1); // bcdef echo substr('abcdef', 1, 3); // bcd echo substr('abcdef', 0, 4); // abcd echo substr('abcdef', 0, 8); // abcdef echo substr('abcdef', -1, 1); // f
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Xdshj
function name:  (null)
number of ops:  30
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'substr'
          1        SEND_VAL                                                 'abcdef'
          2        SEND_VAL                                                 -1
          3        DO_ICALL                                         $0      
          4        ECHO                                                     $0
    4     5        INIT_FCALL                                               'substr'
          6        SEND_VAL                                                 'abcdef'
          7        SEND_VAL                                                 1
          8        SEND_VAL                                                 3
          9        DO_ICALL                                         $1      
         10        ECHO                                                     $1
    5    11        INIT_FCALL                                               'substr'
         12        SEND_VAL                                                 'abcdef'
         13        SEND_VAL                                                 0
         14        SEND_VAL                                                 4
         15        DO_ICALL                                         $2      
         16        ECHO                                                     $2
    6    17        INIT_FCALL                                               'substr'
         18        SEND_VAL                                                 'abcdef'
         19        SEND_VAL                                                 0
         20        SEND_VAL                                                 8
         21        DO_ICALL                                         $3      
         22        ECHO                                                     $3
    7    23        INIT_FCALL                                               'substr'
         24        SEND_VAL                                                 'abcdef'
         25        SEND_VAL                                                 -1
         26        SEND_VAL                                                 1
         27        DO_ICALL                                         $4      
         28        ECHO                                                     $4
         29      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
162.46 ms | 1395 KiB | 15 Q