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<?php $arr = [ "authors" => [ ["fio" => "Пушкин А. С.", "email" => "pushkin@mail.ru"], ["fio" => "Тютчев Ф. И.", "email" => "123@mail.ru"], ], "books" => [ ["nameBook" => "Снегурочка", "email" => "pushkin@mail.ru"], ["nameBook" => "Туман", "email" => "123@mail.ru"], ], ]; $arr["authors"] = array_reduce($arr["authors"], function($res, $el){$res[$el["email"]] = $el["fio"]; return $res;}, []); foreach($arr["books"] as $book ) { echo $book["nameBook"] . ', ее написал ' . $arr["authors"][$book["email"]] . ' email автора: ' . $book["email"] . PHP_EOL; }
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