Online PHP editor | refs for NsPtf

<?php $books_sorted=array( 0 => array( "title" => "In Search of Lost Time" ), 1 => array( "title" => "Don Quixote" ), 2 => array( "title" => "The Great Gatsby" ) ); $books_available=array( 0 => array( "title" => "Moby Dick" ), 1 => array( "title" => "In Search of Lost Time" ), 2 => array( "title" => "The Great Gatsby" ), 3 => array( "title" => "War and Peace" ) ); $books_sorted_titles = array_column($books_sorted, 'title'); usort($books_available, function($k, $v) use ($books_sorted_titles) { return in_array($v['title'], $books_sorted_titles) ? 1 : -1; }); print_r($books_available);