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<?php $input = ['3' => '4', '4' => '5', '1' => '2']; $allowed = ['1', '2', '3']; $flipAllowed = array_flip($allowed); var_export( array_replace( array_intersect_key($flipAllowed, $input), // filtered allowed array_intersect_key($input, $flipAllowed) // filtered input ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ogEN7
function name:  (null)
number of ops:  22
compiled vars:  !0 = $input, !1 = $allowed, !2 = $flipAllowed
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_flip'
          3        SEND_VAR                                                 !1
          4        DO_ICALL                                         $5      
          5        ASSIGN                                                   !2, $5
    8     6        INIT_FCALL                                               'var_export'
    9     7        INIT_FCALL                                               'array_replace'
   10     8        INIT_FCALL                                               'array_intersect_key'
          9        SEND_VAR                                                 !2
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                         $7      
         12        SEND_VAR                                                 $7
   11    13        INIT_FCALL                                               'array_intersect_key'
         14        SEND_VAR                                                 !0
         15        SEND_VAR                                                 !2
         16        DO_ICALL                                         $8      
         17        SEND_VAR                                                 $8
    9    18        DO_ICALL                                         $9      
   11    19        SEND_VAR                                                 $9
    8    20        DO_ICALL                                                 
   13    21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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