3v4l.org

run code in 300+ PHP versions simultaneously
<?php $number = '4XXXXXXX'; var_dump(substr($number, 0, 1)); var_dump(strpos( '123467CF', substr($number, 0, 1) ));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hnvt1
function name:  (null)
number of ops:  22
compiled vars:  !0 = $number
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '4XXXXXXX'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'substr'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 0
          5        SEND_VAL                                                 1
          6        DO_ICALL                                         $2      
          7        SEND_VAR                                                 $2
          8        DO_ICALL                                                 
    7     9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'strpos'
    8    11        SEND_VAL                                                 '123467CF'
    9    12        INIT_FCALL                                               'substr'
         13        SEND_VAR                                                 !0
         14        SEND_VAL                                                 0
         15        SEND_VAL                                                 1
         16        DO_ICALL                                         $4      
         17        SEND_VAR                                                 $4
         18        DO_ICALL                                         $5      
         19        SEND_VAR                                                 $5
         20        DO_ICALL                                                 
   10    21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
175.9 ms | 1395 KiB | 19 Q