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<?php $pattern = '~^(?<animal>DOG|CAT)?(?<color>RED|BLUE)?$~i'; if ( preg_match($pattern, 'dog', $m) ) { $arr = ['animal' => '', 'color' => '']; print_r(array_intersect_key($m, $arr) + $arr); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 16
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 16
filename:       /in/9Ci3u
function name:  (null)
number of ops:  17
compiled vars:  !0 = $pattern, !1 = $m, !2 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%7E%5E%28%3F%3Canimal%3EDOG%7CCAT%29%3F%28%3F%3Ccolor%3ERED%7CBLUE%29%3F%24%7Ei'
    4     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'dog'
          4        SEND_REF                                                 !1
          5        DO_ICALL                                         $4      
          6      > JMPZ                                                     $4, ->16
    5     7    >   ASSIGN                                                   !2, <array>
    6     8        INIT_FCALL                                               'print_r'
          9        INIT_FCALL                                               'array_intersect_key'
         10        SEND_VAR                                                 !1
         11        SEND_VAR                                                 !2
         12        DO_ICALL                                         $6      
         13        ADD                                              ~7      $6, !2
         14        SEND_VAL                                                 ~7
         15        DO_ICALL                                                 
    7    16    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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