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<?php $a = array(1,2,3,3,3,4,1,1,3,2); $b = array_unique($a); //Var_dump($a); //Var_dump($b); Echo Count(array_unique(array_diff_key($a, $b)));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/La1mN
function name:  (null)
number of ops:  15
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'array_unique'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                         $3      
          4        ASSIGN                                                   !1, $3
    8     5        INIT_FCALL                                               'array_unique'
          6        INIT_FCALL                                               'array_diff_key'
          7        SEND_VAR                                                 !0
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                         $5      
         10        SEND_VAR                                                 $5
         11        DO_ICALL                                         $6      
         12        COUNT                                            ~7      $6
         13        ECHO                                                     ~7
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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