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Multidimensional Array Searching - Find key by specific value

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