3v4l.org

run code in 300+ PHP versions simultaneously
<?php $list = array( array('hostname' => 'example.org'), array('hostname' => 'www.example.org'), array('hostname' => 'example.example.org'), ); $keys = array_column($list, 'hostname'); var_dump($keys);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CMK1O
function name:  (null)
number of ops:  10
compiled vars:  !0 = $list, !1 = $keys
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    8     1        INIT_FCALL                                               'array_column'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'hostname'
          4        DO_ICALL                                         $3      
          5        ASSIGN                                                   !1, $3
    9     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
156.95 ms | 1394 KiB | 17 Q