3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(strlen(null)); var_dump(strlen(0)); var_dump(strlen(""));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0X7c7
function name:  (null)
number of ops:  12
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        STRLEN                                           ~0      null
          2        SEND_VAL                                                 ~0
          3        DO_ICALL                                                 
    4     4        INIT_FCALL                                               'var_dump'
          5        STRLEN                                           ~2      0
          6        SEND_VAL                                                 ~2
          7        DO_ICALL                                                 
    5     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAL                                                 0
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
160.89 ms | 1398 KiB | 15 Q