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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); }
Output for rfc.property-hooks, git.master_jit, git.master
Array ( [animal] => dog [color] => )

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