Question

How to use array_intersect_key() to return array with keys of array1 that exist in other arrays in PHP

Answer 1

$arr1 = array("a" => "PHP", "b"=>"C++", "y"=>"C");
$arr2 = array("b" => "PHP", "b"=>"C#", "z"=>"C++");
 
$result = array_intersect_key($arr1, $arr2);
    
print_r($result); 
     
/*
run:
  
Array ( [b] => C++ ) 
       
*/

 

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Answer 2

$arr1 = array("a" => "PHP", "b"=>"C++", "y"=>"C");
$arr2 = array("b" => "PHP", "b"=>"C#", "z"=>"C++");
$arr3 = array("a" => "Python", "b"=>"C#", "y"=>"C++");
 
$result = array_intersect_key($arr1, $arr2, $arr3); 
    
print_r($result); 
     
/*
run:
  
Array ( [b] => C++ ) 
       
*/

 

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