Search for values in nested array

Question

I have an array as follows

array(2) {
  [\"operator\"] => array(2) {
    [\"qty\"] => int(2)
    [\"id\"] => int(251)
  }
  [\"accessory209\"] =>         


        

Answer 1

$map = array();
foreach ($arr as $v) {
    $map[$v['id']] = 1;
}
//then you can just do this as when needed
$exists = isset($map[211]);

Or if you need the data associated with it

$map = array();
foreach ($arr as $k => $v) {
    $map[$v['id']][$k] = $v;
}
print_r($map[211]);

Answer 2

This function is useful in_array(211, $array['accessory']); It verifies the whole specified array to see if your value exists in there and returns true.

in_array

Answer 3

You can use

Arr::getNestedElement($array, $keys, $default = null)

from this library to get value from multidimensional array using keys specified like 'key1.key2.key3' or ['key1', 'key2', 'key3'] and fallback to default value if no element was found. Using your example it will look like:

if (Arr::getNestedElement($array, 'accessory.id') == 211)

Answer 4

<?php

//PHP 5.3 way to do it

function searchNestedArray(array $array, $search, $mode = 'value') {

    foreach (new RecursiveIteratorIterator(new RecursiveArrayIterator($array)) as $key => $value) {
        if ($search === ${${"mode"}})
            return true;
    }
    return false;
}

$data = array(
    array('abc', 'ffffd'),
    'ccc',
    'bbb',
    array('aaa', array('yyy', 'mp' => 555))
);

var_dump(searchNestedArray($data, 555));

Answer 5

I used a static method because i needed it in a class, but if you want you can use it as a simple function.

/**
 * Given an array like this
 * array(
 *   'id' => "first",
 *   'title' => "First Toolbar",
 *   'class' => "col-md-12",
 *   'items' => array(
 *       array(
 *           'tipo' => "clientLink",
 *           'id' => "clientLinkInsert"
 *       )
 *   )
 * )
 *
 * and array search like this
 * array("items", 0, "id")
 * 
 * Find the path described by the array search, in the original array
 *
 * @param array $array source array
 * @param array $search the path to the item es. ["items", 0, "tipo"]
 * @param null|mixed $defaultIfNotFound the default value if the value is not found
 *
 * @return mixed
 */
public static function getNestedKey($array, $search, $defaultIfNotFound = null)
{
    if( count($search) == 0 ) return $defaultIfNotFound;
    else{
        $firstElementSearch = self::array_kshift($search);

        if (array_key_exists($firstElementSearch, $array)) {
            if( count($search) == 0 )
                return $array[$firstElementSearch];
            else
                return self::getNestedKey($array[$firstElementSearch], $search, $defaultIfNotFound);
        }else{
            return $defaultIfNotFound;
        }
    }
}

Answer 6

Hey dardub, you can use array_walk to verify if a particular value is within your array - array_walk iterates through al elements of you array and applys a provided function to them, so basically you would need to create that function. It is used as follows:

$arr = array(
    'one' => array('id' => 1),
    'two' => array('id' => 2),
    'three' => array('id' => 3)
);

function checkValue($value, $key)
{
    echo $value['id'];
}

array_walk($arr, 'checkValue');

You'll just need to add to your function whatever conditionals/validations you'd need.

Hope it helps.

M.

EDIT: PHP docs on array_walk http://www.php.net/manual/en/function.array-walk.php