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@ 2016-06-13T11:22:37Z

<?php
$bookInfo = array(
	0 => array("bookId" => "1",
			   "bookName" => "Book 1",
			   "authorId" => 1,
			   "authorName" => "Author 1")
	,
	1=> array("bookId" => "1",
			  "bookName" => "Book 1",
			  "authorId" => 2,
			  "authorName" => "Author 2")
	,
	2=> array("bookId" => "2",
			  "bookName" => "Book 2",
			  "authorId" => 3,
			  "authorName" => "Author 3")
	,
	3=> array("bookId" => "3",
			  "bookName" => "Book 3",
			  "authorId" => 4,
			  "authorName" => "Author 4")
);

print_r($bookInfo);

$newBookInfo = [];
$newBookKey = [];
$newKey = 0;
foreach($bookInfo as $bookKey => $bookValue){
	
	if(!in_array($bookValue["bookId"],$newBookKey)){
		++$newKey;
		$newBookInfo[$newKey]["bookId"] = $bookValue["bookId"];
		$newBookInfo[$newKey]["bookName"] = $bookValue["bookName"];
	}
	$newBookInfo[$newKey]["authorName"][$bookKey] = $bookValue["authorName"];
	$newBookKey[]  = $bookValue["bookId"];
}

print_r($newBookInfo);

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14: Array ( [0] => Array ( [bookId] => 1 [bookName] => Book 1 [authorId] => 1 [authorName] => Author 1 ) [1] => Array ( [bookId] => 1 [bookName] => Book 1 [authorId] => 2 [authorName] => Author 2 ) [2] => Array ( [bookId] => 2 [bookName] => Book 2 [authorId] => 3 [authorName] => Author 3 ) [3] => Array ( [bookId] => 3 [bookName] => Book 3 [authorId] => 4 [authorName] => Author 4 ) ) Array ( [1] => Array ( [bookId] => 1 [bookName] => Book 1 [authorName] => Array ( [0] => Author 1 [1] => Author 2 ) ) [2] => Array ( [bookId] => 2 [bookName] => Book 2 [authorName] => Array ( [2] => Author 3 ) ) [3] => Array ( [bookId] => 3 [bookName] => Book 3 [authorName] => Array ( [3] => Author 4 ) ) )

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