Settup form script for ajax and post calls - php

Question

i would like to know if its possible to set up my script so it can be handled by http ajax call and alternatively also the classic post way:
on the top i am first doing this:
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){
$AnswerType = 'die';
}
if ($_SERVER['REQUEST_METHOD'] === 'POST'){
$AnswerType = 'session';
}
Then i check if either of these two is set by doing the following:
if ($AnswerType == 'die' || $AnswerType == 'session' ){
*here i run my script*
}
When the script ends i finally try to send all responses in my $respond_message array back the way the form where initialy posted:
if ($AnswerType = 'die'){
die(print_r($respond_message));
}
if ($AnswerType = 'session'){
$_SESSION['formrespondmessage'].= print_r($respond_message);
header("Location: /");
}

Answer 1

You want the script to react different on ajax and on simple post request? I think in this case the best solution is just to pass any variable, which indicates, that data is being sent by ajax. Like this:
postparams['ajax']=1;
$.post(...
And then in php make check like this:
if (isset($_POST['ajax'])) {
code for ajax request
} else {
code for simple post request
}

Answer 2

Not sure about your code, I prefer not to use so complicated scripts, at least you need to add () after serializeArray, possibly everything else looks ok. I would do like this:
<form name="form1" id="form1">
<input type="text" name="qq" value="ww">
</form>
<input type="button" onclick="dt=$('#form1').serializeArray();dt[dt.length]={name: 'ajax', 'value': 1};$.post('test.php', dt, function(data) {alert(data)});">
And in php file just check if isset($_POST["ajax"]). For example, my looks like this:
<?
if (isset($_POST["ajax"])) print_r($_POST);
?>