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<?php $terms = ['one', 'two', 'three', 'one', 'four', 'five', 'two', 'six']; // $output = array_unique($terms); $output = array_keys(array_flip($terms)); print_r($output);
based on 6E2cR
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/LUDAc
function name:  (null)
number of ops:  12
compiled vars:  !0 = $terms, !1 = $output
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   8     1        INIT_FCALL                                               'array_keys'
         2        INIT_FCALL                                               'array_flip'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $3      
         5        SEND_VAR                                                 $3
         6        DO_ICALL                                         $4      
         7        ASSIGN                                                   !1, $4
  10     8        INIT_FCALL                                               'print_r'
         9        SEND_VAR                                                 !1
        10        DO_ICALL                                                 
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0