<?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);