How to remove duplicate items from an array in PHP

• Remove duplicate items from array using array_unique function

  You can use array_unique function to get the unique array items from array. You can use sort() method on $array or you can apply sort() method on $output to sort the array items in ascending order.

  $array = [1, 2, 4, 4, 5];
  $output = array_unique($array);
  print_r($output);
  

  Output :

  Array
  (
      [0] => 2
      [1] => 1
      [3] => 4
      [5] => 5
  )
  

• Remove duplicate items from an array using array_values with array_flip function

  $originalArray = array(1, 2, 3, 4, 2, 5, 6, 1);
  $uniqueArray = array_values(array_flip($originalArray));
  print_r($uniqueArray);
  

  Output :

  Array
  (
      [0] => 7
      [1] => 4
      [2] => 2
      [3] => 3
      [4] => 5
      [5] => 6
  )
  

• Remove duplicat items from array using in_array function in foreach loop

  $array = [2, 1, 2, 3, 3, 4, 5, 5 ,7 , 1];
  sort($array);
  $output = [];
  foreach($array as $arrItem){
  	if(!in_array($arrItem, $output)){
  		$output[] = $arrItem;
  	}
  }
  

  Output:

  Array
  (
      [0] => 1
      [1] => 2
      [2] => 3
      [3] => 4
      [4] => 5
      [5] => 7
  )
  

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