Solution is based on the array_search() function. You need to use PHP 5.5.0 or higher. $userdb=Array ( (0) => Array     (         (uid) => '100',         (name) => 'Sandra Shush',         (url) => 'urlof100'     ), (1) => Array     (         (uid) => '5465',         (name) => 'Stefanie Mcmohn',         (pic_square) => 'urlof100'     ), (2) => Array     (         (uid) => '40489',         (name) => 'Michael',         (pic_square) => 'urlof40489'     ) ); Solution-1: function myfunction($products, $field, $value) {    foreach($products as $key => $product)    {       if ( $product[$field] === $value )          return $key;    }    return false; }   Solution-2: $key = array_search(40489, array_column($userdb, 'uid')); echo ("The key is: ".$key); //This will output- The key is: 2 The function array_search() has two arguments. The first one is the value that yo

Earthquakes with magnitude of about 2.0 or less are usually called microearthquakes; they are not commonly felt by people and are generally recorded only on local seismographs. Events with magnitudes of about 4.5 or greater - there are several thousand such shocks annually - are strong enough to be recorded by sensitive seismographs all over the world. Great earthquakes, such as the 1964 Good Friday earthquake in Alaska, have magnitudes of 8.0 or higher. On the average, one earthquake of such size occurs somewhere in the world each year. Magnitude measures the energy released at the source of the earthquake as determined from measurements on seismographs. An earthquake has one magnitude. The magnitude scale most commonly in use now is called the moment magnitude scale. Moment is a physical quantity proportional to the slip on the fault times the area of the fault surface that slips; it is related to the total energy released in the EQ. The moment magnitude p

Changing a database table prefix is easy and here’s the simple step-by-step guide! For WordPress installations, it’s essential! How to change a prefix 1. In your text editor, change database_name, old_prefix_ and new_prefix_ to the required values: SET @database = "database_name"; SET @old_prefix = "old_prefix_"; SET @new_prefix = "new_prefix_"; SELECT concat( "RENAME TABLE ", TABLE_NAME, " TO ", replace(TABLE_NAME, @old_prefix, @new_prefix), ';' ) AS "SQL"  FROM information_schema.TABLES WHERE TABLE_SCHEMA = @database; 2. Run the query in cPanel or PHPMyAdmin on your WordPress database 3. The output will be a series of SQL queries that will rename the tables for you 4. Run the output 5. Done!   How to add a prefix    If your database doesn’t have a prefix at all, follow the steps above but use the below query that’s been slightly modified fo