PHP multidimensional array search by value

Question

I have an array where I want to search the uid and get the key of the array.

Examples

Assume we have the following 2-dimensional array:

$userdb = array(
    array(
        'uid' => '100',
        'name' => 'Sandra Shush',
        'pic_square' => 'urlof100'
    ),
    array(
        'uid' => '5465',
        'name' => 'Stefanie Mcmohn',
        'pic_square' => 'urlof100'
    ),
    array(
        'uid' => '40489',
        'name' => 'Michael',
        'pic_square' => 'urlof40489'
    )
);

The function call search_by_uid(100) (uid of first user) should return 0.

The function call search_by_uid(40489) should return 2.

I tried making loops, but I want a faster executing code.

Answer 1

If you are using (PHP 5 >= 5.5.0) you don't have to write your own function to do this, just write this line and it's done.

If you want just one result:

$key = array_search(40489, array_column($userdb, 'uid'));

For multiple results

$keys = array_keys(array_column($userdb, 'uid'), 40489);

In case you have an associative array as pointed in the comments you could make it with:

$keys = array_keys(array_combine(array_keys($userdb), array_column($userdb, 'uid')),40489);

If you are using PHP < 5.5.0, you can use this backport, thanks ramsey!

Update: I've been making some simple benchmarks and the multiple results form seems to be the fastest one, even faster than the Jakub custom function!

Answer 2

If question i.e.

$a = [
     [
       "_id" => "5a96933414d48831a41901f2",
       "discount_amount" => 3.29,
       "discount_id" => "5a92656a14d488570c2c44a2",
     ],
     [
       "_id" => "5a9790fd14d48879cf16a9e8",
       "discount_amount" => 4.53,
       "discount_id" => "5a9265b914d488548513b122",
     ],
     [
       "_id" => "5a98083614d488191304b6c3",
       "discount_amount" => 15.24,
       "discount_id" => "5a92806a14d48858ff5c2ec3",
     ],
     [
       "_id" => "5a982a4914d48824721eafe3",
       "discount_amount" => 45.74,
       "discount_id" => "5a928ce414d488609e73b443",
     ],
    [
       "_id" => "5a982a4914d48824721eafe55",
       "discount_amount" => 10.26,
       "discount_id" => "5a928ce414d488609e73b443",
     ],
   ];

Ans:

function searchForId($id, $array) {
    $did=0;
    $dia=0;
   foreach ($array as $key => $val) {
       if ($val['discount_id'] === $id) {
           $dia +=$val['discount_amount'];
           $did++;
       }
   }
    if($dia != '') {
        echo $dia;
        var_dump($did);
    }
   return null;
};
print_r(searchForId('5a928ce414d488609e73b443',$a));

Answer 3

Building off Jakub's excellent answer, here is a more generalized search that will allow the key to specified (not just for uid):

function searcharray($value, $key, $array) {
   foreach ($array as $k => $val) {
       if ($val[$key] == $value) {
           return $k;
       }
   }
   return null;
}

Usage: $results = searcharray('searchvalue', searchkey, $array);

Answer 4

Just share, maybe can like this.

if( ! function_exists('arraySearchMulti')){
function arraySearchMulti($search,$key,$array,$returnKey=false)
{
    foreach ($array as $k => $val) {
        if (isset($val[$key])) {
            if ((string)$val[$key] == (string)$search) {
                return ($returnKey ? $k : $val);
            }
        }else{
            return (is_array($val) ? arraySearchMulti($search,$key,$val,$returnKey) : null);
        }
    }
    return null;
}}

Answer 5

/**
 * searches a simple as well as multi dimension array
 * @param type $needle
 * @param type $haystack
 * @return boolean
 */
public static function in_array_multi($needle, $haystack){
    $needle = trim($needle);
    if(!is_array($haystack))
        return False;

    foreach($haystack as $key=>$value){
        if(is_array($value)){
            if(self::in_array_multi($needle, $value))
                return True;
            else
               self::in_array_multi($needle, $value);
        }
        else
        if(trim($value) === trim($needle)){//visibility fix//
            error_log("$value === $needle setting visibility to 1 hidden");
            return True;
        }
    }

    return False;
}

Answer 6

Try this also

function search_in_array($srchvalue, $array)
{
    if (is_array($array) && count($array) > 0)
    {
        $foundkey = array_search($srchvalue, $array);
        if ($foundkey === FALSE)
        {
            foreach ($array as $key => $value)
            {
                if (is_array($value) && count($value) > 0)
                {
                    $foundkey = search_in_array($srchvalue, $value);
                    if ($foundkey != FALSE)
                        return $foundkey;
                }
            }
        }
        else
            return $foundkey;
    }
}