3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(substr("this string is very very very long", 0, 24)); var_dump(substr("this is a short string", 0, 24));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/AIONh
function name:  (null)
number of ops:  17
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'substr'
          2        SEND_VAL                                                 'this+string+is+very+very+very+long'
          3        SEND_VAL                                                 0
          4        SEND_VAL                                                 24
          5        DO_ICALL                                         $0      
          6        SEND_VAR                                                 $0
          7        DO_ICALL                                                 
    4     8        INIT_FCALL                                               'var_dump'
          9        INIT_FCALL                                               'substr'
         10        SEND_VAL                                                 'this+is+a+short+string'
         11        SEND_VAL                                                 0
         12        SEND_VAL                                                 24
         13        DO_ICALL                                         $2      
         14        SEND_VAR                                                 $2
         15        DO_ICALL                                                 
         16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
153.86 ms | 1394 KiB | 17 Q