Accessing elements in array
Array (
    [0] => Array (
        [0] => Array (
            [sum(`Lgsl`.`players`)] => 7769
        )
    )
)

list ($number) = array_values($arr[0][0]);

$var = $a[0][0][array_search(7769, $a[0][0])]; // to do it perfect, you can add isset() check.

$a = array(0 => array(0 => array('some' => 7769)));

$var = $a[0][0][array_search(7769, $a[0][0])];

echo $var;