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<?php $relate_to = array(11,22); $before = NULL; $relate_to_before = explode(',', $before); sort($relate_to_before); $relate_to_new = array_diff($relate_to, $relate_to_before); var_dump($relate_to_new);
based on PYiTX
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/EUZJX
function name:  (null)
number of ops:  19
compiled vars:  !0 = $relate_to, !1 = $before, !2 = $relate_to_before, !3 = $relate_to_new
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        ASSIGN                                                   !1, null
   5     2        INIT_FCALL                                               'explode'
         3        SEND_VAL                                                 '%2C'
         4        SEND_VAR                                                 !1
         5        DO_ICALL                                         $6      
         6        ASSIGN                                                   !2, $6
   8     7        INIT_FCALL                                               'sort'
         8        SEND_REF                                                 !2
         9        DO_ICALL                                                 
   9    10        INIT_FCALL                                               'array_diff'
        11        SEND_VAR                                                 !0
        12        SEND_VAR                                                 !2
        13        DO_ICALL                                         $9      
        14        ASSIGN                                                   !3, $9
  12    15        INIT_FCALL                                               'var_dump'
        16        SEND_VAR                                                 !3
        17        DO_ICALL                                                 
        18      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0