if（$ success），提示/警告而不是echo。 怎么样？

Question

I'm a total newbie on PHP, but I can change the code a bit to fit my needs. I have a form that when you send it, it shows a message of success/fail inside the page. But instead of the message appearing inside the page, I just wanted a prompt / alert showing the success/fail message.

So what I have is

if ($success){ echo "Sent! Thank you";}
else{  echo "Ops! Try again!";}

Any ideas? Thank you so much in advance

Answer 1

I suspect you might not want what you say you want but…

if ($success){ 
    $message = "Sent! Thank you";
} else {
    $message = "Ops! Try again!";
}
?><script>
    prompt(<?php echo json_encode($message); ?>);
</script>
<noscript>
    <p><?php echo htmlspecialchars($message); ?></p>
</noscript>

Note: Given a string for input, json_encode will output a JavaScript string literal that is safe for inclusion in an HTML script element. It will not output JSON.

While the strings themselves don't contain any special characters, it is a good habit to run this sort of XSS protection against anything you output that isn't explicitly HTML/JS/etc.