how to pass java script prompt msg variable value in to php.
<?php
echo '<script type="text/javascript">
var msg = window.prompt("Input a value", ""); alert(msg);
</script>';
//then need to use input value to php
echo $value; //how to get JS value to here?
?>
or is there any other way to get php prompt massages to input value?
No, you can't do it directly like this. You need to pass the value from javascript to PHP. One easy way of doing so would be using redirect:
<?php
echo '<script type="text/javascript">
var value = prompt("Input a value", "");
window.location.href = '?value='+encodeURIComponent(value);
</script>';
//then need to use input value to php
if (isset($_GET['value'])) {
echo htmlspecialchars($value);
}
?>
Even though this is very simple example based upon your code, there are more advanced ways of achieving your goal. But this is to get you going.
You cannot do that as php is a server side language, it is interpreted before any javascript.
What you need is using AJAX, or using a form.
Both can do the work, the difference is that with Ajax you won't have to reload the page (nor load any other).
You can try this
echo "<script>var email=prompt('Enter user mail')</script>";
$email="<script>document.write(email)</script>";
