SELECT * FROM table WHERE kol_vo <> 0 ORDER BY RAND()foreach($results as $result) {
echo $result['zak'];
// Выполняем запрос обновления
UPDATE table SET kol_vo = kol_vo - 1 WHERE id = $result['id'];
}document.getElementById("sendButton").addEventListener("click", function() {
//this.classList.add("class_1");
this.disabled = true;
setTimeout(function() {
document.getElementById("sendButton").disabled = false;
}, 3000);
});