<?php
if (isset($_POST[“AAA”])){
echo “ISSET”;
}else{
echo “UNSET”;
}

这里要构造表单的
<form enctype="application/x-www-form-urlencoded" action="http://10.16.83.113/exec.php" method="POST">
<input type="text" name="radiobutton" value="homeway">
<input type="text" name="key" value="nokey">
<input type="submit" value="submit">
</form>

或者直接burp改,但是必须要Content-Type: application/x-www-form-urlencoded