3v4l.org

run code in 300+ PHP versions simultaneously
<?php $domainNumber = "3"; var_dump(substr($domainNumber, 0, 1)); if (!substr($domainNumber, 0, 1) == '_') { $domainNumber = "_$domainNumber"; } var_dump($domainNumber);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 17, Position 2 = 20
Branch analysis from position: 17
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 20
filename:       /in/J16nV
function name:  (null)
number of ops:  24
compiled vars:  !0 = $domainNumber
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '3'
    4     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                                                 
    5     9        INIT_FCALL                                               'substr'
         10        SEND_VAR                                                 !0
         11        SEND_VAL                                                 0
         12        SEND_VAL                                                 1
         13        DO_ICALL                                         $4      
         14        BOOL_NOT                                         ~5      $4
         15        IS_EQUAL                                                 ~5, '_'
         16      > JMPZ                                                     ~6, ->20
    7    17    >   NOP                                                      
         18        FAST_CONCAT                                      ~7      '_', !0
         19        ASSIGN                                                   !0, ~7
   10    20    >   INIT_FCALL                                               'var_dump'
         21        SEND_VAR                                                 !0
         22        DO_ICALL                                                 
         23      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
149.92 ms | 1395 KiB | 17 Q