In_Array() and Multidimensional Array

in_array() and multidimensional array

in_array() does not work on multidimensional arrays. You could write a recursive function to do that for you:

function in_array_r($needle, $haystack, $strict = false) {
    foreach ($haystack as $item) {
        if (($strict ? $item === $needle : $item == $needle) || (is_array($item) && in_array_r($needle, $item, $strict))) {
            return true;
        }
    }

    return false;
}

Usage:

$b = array(array("Mac", "NT"), array("Irix", "Linux"));
echo in_array_r("Irix", $b) ? 'found' : 'not found';

Using in_array for multidimensional arrays

$array = array(
   "0" => array(
      "receiver_telmob" => "0707105396",
      "0"               => "0707105396"
   ),
   "1" => array(
      "receiver_telmob" => "0704671668",
      "0"               => "0704671668"
   ),
   "2" => array(
      "receiver_telmob" => "0707333311",
      "0"               => "0707333311"
   )
);

$searchnumber = "0707333311";

foreach($array as $v) {
   if ($v['receiver_telmob'] == $searchnumber) {
      $found = true;
   }
}

echo (isset($found) ? 'search success' : 'search failed');

search with in_array in multidimensional array

Try array_key_exists(): link

if(array_key_exists('name', $false['name'])) {
    echo $false['name'][0]; // or [1] .. or whatever you want to echo
}

in_array() on multidimensional array

Using in_array search for values, but in your code Peter is a key. Then you can use array_key_exists instead:

$people = array(
    "Peter" => array (
        "test" => 0
    ),
    "Joe"
);

if (array_key_exists("Peter", $people))
{
    echo "Match found";
}
else
{
    echo "Match not found";
}

Output

Match found

you can combine both since the name you're searching is sometimes the value like "Joe" in your example.

if (array_key_exists("Peter", $people) || in_array("Peter", $people)) {
    echo "Match found";
} else {
    echo "Match not found";
}

in_array() not working with two dimensional associative array?

You should use array_column() which will return the values from a single column in the input array as an array.

$product_auto_ids = array_column($array['cart_item'], 'product_auto_id');

In this case, it would return the following:

Array
(
    [0] => 556729685
    [1] => 951790801
)

Then you can use in_array() like you currently are.

in_array(556729685, $product_auto_ids);

How to reshape a flattened array to a multidimensional array in arbitray shape in Javascript?

Here's my solution:

const A = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
const C = [3, 4];

function unflattenArray(arr, dim) {
  let elemIndex = 0;

  if (!dim || !arr) return [];

  function _nest(dimIndex) {
    let result = [];

    if (dimIndex === dim.length - 1) {
      result = result.concat(arr.slice(elemIndex, elemIndex + dim[dimIndex]));
      elemIndex += dim[dimIndex];
    } else {
      for (let i = 0; i < dim[dimIndex]; i++) {
        result.push(_nest(dimIndex + 1));
      }
    }

    return result;
  }
  return _nest(0);
}

console.log(unflattenArray(A, C));