检查数组是否在另一个数组中并且它们是相同的

Question

I have a $_SESSION['basket'] containing multiple arrays. I want to check if this $_SESSION['basket'] variable contains a specific array and that they have the same values.

For example, I want to check that $my_array which is an array is the same as $_SESSION['basket'][i].

$_SESSION['basket'] would contain multiple arrays as follow :

$_SESSION['basket'] = array(
  [0] => array(
    "key1" => "value1",
    "key2" => "value2"
  );
  [1] => array(
    "key3" => "value3",
    "key4" => "value4"
  );
  [2] => array(
    "key5" => "value5",
    "key6" => "value6"
  );
);

And $my_array would contain :

array(
  "key3" => "value3",
  "key4" => "value4"
);

So I want to make sure that the $my_array variable is contained inside the $_SESSION['basket'] variable and it's values are exactly the same obviously. Is there a way to do that without having to use a loop? If not, how to do it with a loop nonetheless?

Answer 1

Well, you will have to use a loop. Even if you use any PHP API, it loops under the hood anyway.

<?php 

function checkIfExists($haystack,$needle){
  foreach($haystack as $each_needle){
      if(isEqual($each_needle,$needle)) return true;
  }

  return false;
}

function isEqual($test,$original){
  foreach($original as $each_key => $each_value){
    if(!isset($test[$each_key]) || $test[$each_key] !== $each_value) return false;
  }

  return count($test) === count($original);
}


$_SESSION['basket'] = array(
  array(
    "key1" => "value1",
    "key2" => "value2"
  ),
  array(
    "key3" => "value3",
    "key4" => "value4"
  ),
  array(
    "key5" => "value5",
    "key6" => "value6"
  )
);

$my_array = array(
  "key3" => "value3",
  "key4" => "value4"
);

var_dump(checkIfExists($_SESSION['basket'],$my_array));

OUTPUT

bool(true)