Returning error messages from PHP via Ajax

[stockton]

I am not sure that I understand the relationship between Ajax and a php script it calls.

Basically what I am trying to understand is how do I return an error message from my PHP script to the Ajax/Javascript that called that PHP and how do I exit that PHP script at the point where the error occurred.

Is it as simple as :-

echo $Message;

exit:

[mainewoods]

echo $Message;
exit:

it is that simple!  You might want to prefix it with some code so that when it is recieved by ajax it can tell it is an error:

echo '**ERROR**' . $Message;
exit:

when ajax recieves its response, it will test the first characters of the response for '**ERROR**'

[stockton]

Thank you