3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo substr("Hello world",10); echo “\n”; echo substr("Hello world",2); echo “\n”; echo substr("Hello world",3); echo “\n”; echo substr("Hello world",7); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/3OvCM
function name:  (null)
number of ops:  27
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'substr'
          1        SEND_VAL                                                 'Hello+world'
          2        SEND_VAL                                                 10
          3        DO_ICALL                                         $0      
          4        ECHO                                                     $0
    3     5        FETCH_CONSTANT                                   ~1      '%E2%80%9C%5Cn%E2%80%9D'
          6        ECHO                                                     ~1
    4     7        INIT_FCALL                                               'substr'
          8        SEND_VAL                                                 'Hello+world'
          9        SEND_VAL                                                 2
         10        DO_ICALL                                         $2      
         11        ECHO                                                     $2
    5    12        FETCH_CONSTANT                                   ~3      '%E2%80%9C%5Cn%E2%80%9D'
         13        ECHO                                                     ~3
    6    14        INIT_FCALL                                               'substr'
         15        SEND_VAL                                                 'Hello+world'
         16        SEND_VAL                                                 3
         17        DO_ICALL                                         $4      
         18        ECHO                                                     $4
    7    19        FETCH_CONSTANT                                   ~5      '%E2%80%9C%5Cn%E2%80%9D'
         20        ECHO                                                     ~5
    8    21        INIT_FCALL                                               'substr'
         22        SEND_VAL                                                 'Hello+world'
         23        SEND_VAL                                                 7
         24        DO_ICALL                                         $6      
         25        ECHO                                                     $6
    9    26      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
167.22 ms | 1395 KiB | 15 Q