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我正嘗試從下拉框中選擇的內容創建變量。我已經得到它顯示什麼已被選中，但希望它被存儲在一個變量，以便我可以做一個進一步的MySQL查詢。任何幫助將大規模讚賞。從選定的下拉框中創建變量
$sql="select perf_id, perf_datetime, perf_site, perf_responsetime from responsetimes where perf_responsetime > 10.00 and perf_responsetime < 25.00 and perf_datetime >= now() - INTERVAL 5 DAY group by perf_responsetime HAVING COUNT(*)>1 ORDER BY perf_site ASC;";
?>
<form action="action.php">
<select id="mySelect">
<?php
foreach ($conn->query($sql) as $row){//Array or records stored in $row
if($row[perf_id]==10){
echo "<option value=$row[perf_site] selected>$row[perf_site]</option>";
}else{
echo "<option value=$row[perf_site]>$row[perf_site]</option>";
}
<button type="button" onclick="myFunction()">Submit</button>
<p id="demo"></p>
</form>
<script>
function myFunction() {
var x = document.getElementById("mySelect").value;
document.getElementById("demo").innerHTML = x;
}
</script>
這將輸出dropbox並提交按鈕，但希望將它存儲在變量中。