3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a .= "xxx"; print_r($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/uYXqA
function name:  (null)
number of ops:  6
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, <array>
   5     1        ASSIGN_CONCAT                                 0          !0, 'xxx'
   7     2        INIT_FCALL                                               'print_r'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                                 
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0