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<?php $first = array(1,1,2,3,4); $second = array(1,2,3,4,5); echo count(array_intersect(array_unique($first), array_unique($second)));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PMYH6
function name:  (null)
number of ops:  15
compiled vars:  !0 = $first, !1 = $second
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    4     1        ASSIGN                                                       !1, <array>
    6     2        INIT_FCALL                                                   'array_intersect'
          3        INIT_FCALL                                                   'array_unique'
          4        SEND_VAR                                                     !0
          5        DO_ICALL                                             $4      
          6        SEND_VAR                                                     $4
          7        INIT_FCALL                                                   'array_unique'
          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 8.5.0


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