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array_replace_recursive()

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<?php
$array 
array_replace_recursive (
    
// array $array1
    
// array $array2
    
  // [array $array3]
);
?>
Result
$array = [
  
'citrus' => [
    
=> 'pineapple',
  ],
  
'berries' => [
    
=> 'blueberry',
    
=> 'raspberry',
  ],
  
'others' => 'litchis',
]
Examples
#1 array_replace_recursive  (["citrus" => [=> "orange"], "berries" => [=> "blackberry"=> "raspberry"]],
 [
"citrus" => [=> "pineapple"], "berries" => [=> "blueberry"]])
#2 array_replace_recursive  (["citrus" => [=> "orange"], "berries" => [=> "blackberry"=> "raspberry"], "others" => "banana"],
 [
"citrus" => "pineapple""berries" => [=> "blueberry"], "others" => [=> "litchis"]],
 [
"citrus" => [=> "pineapple"], "berries" => [=> "blueberry"], "others" => "litchis"])
See also
array_merge_recursive, array_replace