PHP multidimensional array search by value

You can do that with combination of two functions, array_search & array_column.

$search_value = '5465';
$search_key   = 'uid';
$user = array_search($search_value, array_column($userdb, $search_key));

print_r($userdb[$user]);

5465 is the user ID you want to search, uid is the key that contains user ID and $userdb is the array that is defined in the question.

References:

array_search on php.net

array_column on php.net

I want to check tha in the following array $arr is there 'abc' exists in sub arrays or not

$arr = array(
    array(
        'title' => 'abc'
    )
);

Then i can use this

$res = array_search('abc', array_column($arr, 'title'));
if($res == ''){
    echo 'exists';
} else {
    echo 'notExists';
}

I think This is the Most simple way to define

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;
}}

No one else has used array_reduce yet, so thought I'd add this approach...

$find_by_uid = '100';
$is_in_array = array_reduce($userdb, function($carry, $user) use ($find_by_uid){
    return $carry ? $carry : $user['uid'] === $find_by_uid;
}); 
// Returns true

Gives you more fine control over the 'search' logic than array_search().

Note that I have used strict equality here but you could opt for different comparison logic. The $carry means the comparison needs to be true once, and the final result will be TRUE.

Here is a better solution, in case your pulling data from a database or a multidimensional array

Example of a multidimensional array:

$records = array(
            array(
                'id' => 2135,
                'first_name' => 'John',
                'last_name' => 'Doe',
            ),
            array(
                'id' => 3245,
                'first_name' => 'Sally',
                'last_name' => 'Smith',
            ),
            array(
                'id' => 5342,
                'first_name' => 'Jane',
                'last_name' => 'Jones',
            ),
            array(
                'id' => 5623,
                'first_name' => 'Peter',
                'last_name' => 'Doe',
            )
            );


            function search_user_by_name($name, $array) {
                             foreach ($array as $keys) {
                                 foreach ($keys as $key => $_user_record) {
                                     if ($_user_record == $name) {
                                         return [$key => $_user_record];//Return and array of user
                                     }
                                 }
                             }
                             return null;
                        }

Call the function:

$results = search_user_by_name('John', $records);
         print_r($results);
         

Output: Array ( [first_name] => John )

I was looking for functionality similar to that of MySQL LIKE %term%. Based on the answers on this page. I am able to search the JSON array from a file.

user_list.json looks as sample below:

{
  "user-23456": {
        "name": "John Doe",
        "age": "20",
        "email": "doe@sample.com",
        "user_id": "23456"
    },
    "user-09876": {
        "name": "Ronojoy Adams",
        "age": "35",
        "email": "joy@sample.com",
        "user_id": "09876"
    },
    "user-34890": {
        "name": "Will Artkin",
        "age": "16",
        "email": "will@sample.com",
        "user_id": "34890"
    },
}

/*
*search_key_like
*/

function search_key_like($value, $key, $array) {
     $results=array();
    $keyword = preg_quote($value, '~');
   foreach ($array as $k => $val) {
//if name a is spell John and keyword is sent as joh or JOH it will return null
//to fix the issue convert the string into lowercase and uppercase
       $data=array($val[$key],strtolower($val[$key]),strtoupper($val[$key]));
       if (preg_grep('~' . $keyword . '~', $data)) {
       array_push($results,$val[$key]);           
    }
   }
   return $results;
}

Usage===pulling the JSON file===

 $user_list_json='./user_list.json';
    if(file_exists($user_list_json) && file_get_contents($user_list_json)){
    $file_json_data=file_get_contents($user_list_json);
        
    $json_array_data=json_decode($file_json_data,true);
        
        $user_name_like = search_key_like('ron', 'name', $json_array_data);
   
         print "<pre>".print_r($user_name_like,true);
    }