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<?php $a = "abcdefffefa"; $b = "afe"; print(str_replace(array_uniq(explode('', $a)), '', $b));
based on tQNQDP
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/PX8bg
function name:  (null)
number of ops:  16
compiled vars:  !0 = $a, !1 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'abcdefffefa'
   4     1        ASSIGN                                                   !1, 'afe'
   6     2        INIT_FCALL                                               'str_replace'
         3        INIT_FCALL_BY_NAME                                       'array_uniq'
         4        INIT_FCALL                                               'explode'
         5        SEND_VAL                                                 ''
         6        SEND_VAR                                                 !0
         7        DO_ICALL                                         $4      
         8        SEND_VAR_NO_REF                               4          $4
         9        DO_FCALL                                      0  $5      
        10        SEND_VAR                                                 $5
        11        SEND_VAL                                                 ''
        12        SEND_VAR                                                 !1
        13        DO_ICALL                                         $6      
        14        ECHO                                                     $6
        15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0