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<?php $array = array ( // Sub-array 1 array ( // Story 'Monkey 1' - Has identical sub-sub-arrays 'Monkey 2' and 'Monkey 3' and will be merged with them. array ( "header" => "This is a story about a monkey.", 'keywords' => array( "Trees", "Monkey", "Flying", "Drink", "Vacation", "Coconut", "Big", "Bonobo", "Climbing") ), // Story 'Cat 1' - Has identical sub-sub-array 'Cat 2' and will be merged with it. array ( "header" => "Here's a catarific story about a cat", 'keywords' => array( "meauw", "raaaw", "kitty", "growup", "Fun", "claws", "fish", "salmon") ) ), // Sub-array 2 array ( // Story 'Monkey 2' - Has identical sub-sub-arrays 'Monkey 1' and 'Monkey 3' and will be merged with them. array ( "header" => "This is another, but different story, about a monkey.", 'keywords' => array( "Monkey", "Big", "Trees", "Bonobo", "Fun", "Dance", "Cow", "Coconuts") ), // Story 'Cat 2' - Has identical sub-sub-array 'Cat 1' and will be merged with it. array ( "header" => "Here's a different story about a cat", 'keywords' => array( "meauwe", "ball", "cat", "kitten", "claws", "sleep", "fish", "purr") ) ), // Sub-array 3 array ( // Story 'Monkey 3' - Has identical sub-sub-arrays 'Monkey 1' and 'Monkey 2' and will be merged with them. array ( "header" => "This is a third story about a monkey.", 'keywords' => array( "Jungle", "tree", "monkey", "Bonobo", "Fun", "Dance", "climbing", "Coconut", "pretty") ), // Story 'Fireman 1' - Has no identical sub-sub-arrays and will not be merged. array ( "header" => "This is a story about a fireman", 'keywords' => array( "fire", "explosion", "burning", "rescue", "happy", "help", "water", "car") ) ) ); $new =[]; foreach($array as $subarr){ $new = array_merge($new, $subarr); } var_dump($new);
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0beta1
array(6) { [0]=> array(2) { ["header"]=> string(31) "This is a story about a monkey." ["keywords"]=> array(9) { [0]=> string(5) "Trees" [1]=> string(6) "Monkey" [2]=> string(6) "Flying" [3]=> string(5) "Drink" [4]=> string(8) "Vacation" [5]=> string(7) "Coconut" [6]=> string(3) "Big" [7]=> string(6) "Bonobo" [8]=> string(8) "Climbing" } } [1]=> array(2) { ["header"]=> string(36) "Here's a catarific story about a cat" ["keywords"]=> array(8) { [0]=> string(5) "meauw" [1]=> string(5) "raaaw" [2]=> string(5) "kitty" [3]=> string(6) "growup" [4]=> string(3) "Fun" [5]=> string(5) "claws" [6]=> string(4) "fish" [7]=> string(6) "salmon" } } [2]=> array(2) { ["header"]=> string(53) "This is another, but different story, about a monkey." ["keywords"]=> array(8) { [0]=> string(6) "Monkey" [1]=> string(3) "Big" [2]=> string(5) "Trees" [3]=> string(6) "Bonobo" [4]=> string(3) "Fun" [5]=> string(5) "Dance" [6]=> string(3) "Cow" [7]=> string(8) "Coconuts" } } [3]=> array(2) { ["header"]=> string(36) "Here's a different story about a cat" ["keywords"]=> array(8) { [0]=> string(6) "meauwe" [1]=> string(4) "ball" [2]=> string(3) "cat" [3]=> string(6) "kitten" [4]=> string(5) "claws" [5]=> string(5) "sleep" [6]=> string(4) "fish" [7]=> string(4) "purr" } } [4]=> array(2) { ["header"]=> string(37) "This is a third story about a monkey." ["keywords"]=> array(9) { [0]=> string(6) "Jungle" [1]=> string(4) "tree" [2]=> string(6) "monkey" [3]=> string(6) "Bonobo" [4]=> string(3) "Fun" [5]=> string(5) "Dance" [6]=> string(8) "climbing" [7]=> string(7) "Coconut" [8]=> string(6) "pretty" } } [5]=> array(2) { ["header"]=> string(31) "This is a story about a fireman" ["keywords"]=> array(8) { [0]=> string(4) "fire" [1]=> string(9) "explosion" [2]=> string(7) "burning" [3]=> string(6) "rescue" [4]=> string(5) "happy" [5]=> string(4) "help" [6]=> string(5) "water" [7]=> string(3) "car" } } }