如何从PHP变量中的onClick获取值

Question

<form method="post" action="#">
name <input type="text" name="na" />
Male <input type="radio" name="r" value="Male" />
Female <input type="radio" name="r" value="FeMale" />
<input type="submit" name="sbt" onclick="return confirm('are sure');"  />
</form>

</body>
</html>

<?php
$a ="";
if(isset($_POST['sbt']))
{
    echo $a=
}

?>

I want to get value true or false from ONCLICK function in $a variable of PHP.

Answer 1

You can't get result of it inside PHP variable $a without posting it to script, you need to use jQuery or equivalent to post value to server and receive answer and then modify your html code or do anything you want