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<?php $myarr = ['lol' => 'abc', 'beproud' => true, 'notproud' => NULL]; $c = end((array_keys($myarr))); var_dump($c); ?>
based on kuLmD
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Sjqer
function name:  (null)
number of ops:  12
compiled vars:  !0 = $myarr, !1 = $c
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        INIT_FCALL                                               'end'
         2        INIT_FCALL                                               'array_keys'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $3      
         5        SEND_VAR_NO_REF                               0          $3
         6        DO_ICALL                                         $4      
         7        ASSIGN                                                   !1, $4
   5     8        INIT_FCALL                                               'var_dump'
         9        SEND_VAR                                                 !1
        10        DO_ICALL                                                 
   7    11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0