How to remove duplicate values from Array in PHP

• Remove duplicate elements from indexed array in PHP

  $myArray = [11,34,56,78,34,78];
  $myArrayNew = array_unique($myArray);
  print_r($myArrayNew);
  

  //Output
  Array ( [0] => 11 [1] => 34 [2] => 56 [3] => 78 )

  We can use the array_unique method to remove duplicate records from the array. In our case, we have two duplicate records 34 and 78. After using array_unique() method we get array elements with 11, 34, 56, and 78 so we can see that this array method removes duplicate records from indexed arrays.    

• Remove duplicate elements of associative array in PHP

  $result = array(
     0=>array('a'=>1,'b'=>'Hello'),
     1=>array('a'=>1,'b'=>'john'),
     2=>array('a'=>1,'b'=>'john')
  );
  $unique = array_map("unserialize", array_unique(array_map("serialize", $result)));
  print_r($unique);
  

  //Output
  Array ( [0] => Array ( [a] => 1 [b] => Hello ) [1] => Array ( [a] => 1 [b] => john ) )

  It removes array elements if both keys and values are the same in the associative array else it treats as a unique element if keys and values are different with compared to other elements

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