PHP - Write program to combine indexed array with associate array

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Requirements

Write program to combine indexed array with associate array

Imagine that two arrays containing book and author information have been pulled from a database:

Demo

$authors = array("A","B","C","D","Milton","O");

  $books = array(
    array(/*from w ww  . j a  va2  s .c  o m*/
     "title"=> "Json",
     "authorId"=>  2,
     "pubYear"=>  2001
 ),
    array(
     "title"=> "Java",
     "authorId"=>  0,
     "pubYear"=>  2018
 ),
    array(
     "title"=> "MySQL",
     "authorId"=>  3,
     "pubYear"=>  2002
 ),
    array(
     "title"=> "Python",
     "authorId"=>  4,
     "pubYear"=>  1667
 ),
    array(
     "title"=> "Testing",
     "authorId"=>  5,
     "pubYear"=>  1945
 ),
    array(
     "title"=> "Database",
     "authorId"=>  1,
     "pubYear"=>  2017
 ),
);

Result

Write a script to add an"authorName" element to each associative array within the $books array that contains the author name string pulled from the $authors array.

Display the resulting $books array.

Demo

<?php
$authors = array("A","B","C","D","M","O");

$books = array(/*from w w  w . ja va2  s. c  o m*/
  array(
   "title"=>"Json",
   "authorId"=> 2,
   "pubYear"=> 2001
),
  array(
   "title"=>"Java",
   "authorId"=> 0,
   "pubYear"=> 2018
),
  array(
   "title"=>"MySQL",
   "authorId"=> 3,
   "pubYear"=> 2002
),
  array(
   "title"=>"Python",
   "authorId"=> 4,
   "pubYear"=> 1667
),
  array(
   "title"=>"Testing",
   "authorId"=> 5,
   "pubYear"=> 1945
),
  array(
   "title"=>"Database",
   "authorId"=> 1,
   "pubYear"=> 2017
),
);

foreach ($books as &$book) {
  $book["authorName"] = $authors[$book["authorId"]];
}

print_r($books);

?>

Result

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