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array_intersect()

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<?php
$array 
array_intersect (
    
// array $array1
    
  // array $array2
);
?>
Result
$array = [
  
'a' => 'green',
  
=> 'red',
]
Examples
#1 array_intersect  (["a" => "green"=> "red"=> "blue"],
 [
"b" => "green"=> "yellow"=> "red"])
See also
array_diff, array_diff_assoc, array_intersect_assoc, array_intersect_key, array_intersect_uassoc, array_intersect_ukey