3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = array('tttt'=> 100, "color" => "red"); print_r(array_keys($array)[1]);
based on TrOGV
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/5cYG0
function name:  (null)
number of ops:  9
compiled vars:  !0 = $array
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, <array>
   4     1        INIT_FCALL                                               'print_r'
         2        INIT_FCALL                                               'array_keys'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $2      
         5        FETCH_DIM_R                                      $3      $2, 1
         6        SEND_VAR                                                 $3
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0