3v4l.org

run code in 200+ php & hhvm versions
<?php $var1 = str_repeat(" ", 4); $var2 = str_repeat(" ", 4); $var1[0] = $var2[0] = "1"; $var1[1] = "2"; $var2[1] = "3"; $var1[2] = $var2[2] = "4"; $var1[3] = $var2[3] = "5"; echo 'Var1: ' . $var1 . ', Var2: ' . $var2;
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/uju0s
function name:  (null)
number of ops:  31
compiled vars:  !0 = $var1, !1 = $var2
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'str_repeat'
         1        SEND_VAL                                                 '+'
         2        SEND_VAL                                                 4
         3        DO_ICALL                                         $2      
         4        ASSIGN                                                   !0, $2
   3     5        INIT_FCALL                                               'str_repeat'
         6        SEND_VAL                                                 '+'
         7        SEND_VAL                                                 4
         8        DO_ICALL                                         $4      
         9        ASSIGN                                                   !1, $4
   5    10        ASSIGN_DIM                                       $7      !1, 0
        11        OP_DATA                                                  '1'
        12        ASSIGN_DIM                                               !0, 0
        13        OP_DATA                                                  $7
   6    14        ASSIGN_DIM                                               !0, 1
        15        OP_DATA                                                  '2'
   7    16        ASSIGN_DIM                                               !1, 1
        17        OP_DATA                                                  '3'
   8    18        ASSIGN_DIM                                       $11     !1, 2
        19        OP_DATA                                                  '4'
        20        ASSIGN_DIM                                               !0, 2
        21        OP_DATA                                                  $11
   9    22        ASSIGN_DIM                                       $13     !1, 3
        23        OP_DATA                                                  '5'
        24        ASSIGN_DIM                                               !0, 3
        25        OP_DATA                                                  $13
  11    26        CONCAT                                           ~14     'Var1%3A+', !0
        27        CONCAT                                           ~15     ~14, '%2C+Var2%3A+'
        28        CONCAT                                           ~16     ~15, !1
        29        ECHO                                                     ~16
        30      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0