Does value exist in array

in_array() checks if the specified value exits in the array. <<Best for value matching test

  if (in_array("MySearchValue", $MyArray, True))
    //Do something

  if (!in_array("MySearchValue", $MyArray, True))
    //Do something

array_search() searches an array for a given value and returns the key, or False

  if (array_search("MySearchValue", $MyArray, True) !== False)
    //Do something

Note that in_array() is the better choice if you are value matching within an array, because you can test for a True result. array_search() can return a not False result in error conditions

Search a simple array 1 dimensional array

  if (array_search($NewValue, $MyArray) === False)
  {
    //Does not exist
    $MyArray[] = $NewValue;
  }

  //To test if true (returns index if True, so use not false)
  if (array_search($NewValue, $MyArray) !== False)
      
  //For a nested array
  if (array_search($NewValue, $MyArray[$MyKey]['SomeField']) === False)
  {
    //Does not exist
    $MyArray[$MyKey]['SomeField'][] = $NewValue;
  }

#Does a field value exist within a multi dimensional array?

  $MyMultiDimArray = array(    
    0 =>  array(  
      "id" =>  14,
      "name" => "Adam",
    ),  
    1   =>  array(  
        "id" => 2032,
        "name" => "James"
    ), 
    2   =>  array(  
        "id" => 18,
        "name" => "Jane"
    )
  );


  //Simple exists or not
  if (array_search(2032, array_column($MyMultiDimArray, 'id')) !== False)
    echo 'FOUND!';
  else
    echo 'NOT FOUND!';


  //Get key if it exists - looking for match
  $Key = array_search(2032, array_column($MyMultiDimArray, 'id'));
  if ($Key !== False)
  {
    $Name = $MyMultiDimArray[$Key]['name'];
  }


  //Get key if it exists  - create if not exist
  $Key = array_search(2032, array_column($MyMultiDimArray, 'id'));
  if ($Key === False)
  {
    $MyMultiDimArray[]['id'] = 2032;
    $Key = count($MyMultiDimArray) - 1;
  }
USEFUL?
We benefit hugely from resources on the web so we decided we should try and give back some of our knowledge and resources to the community by opening up many of our company’s internal notes and libraries through mini sites like this. We hope you find the site helpful.
Please feel free to comment if you can add help to this page or point out issues and solutions you have found, but please note that we do not provide support on this site. If you need help with a problem please use one of the many online forums.

Comments

Your email address will not be published.