Passing a PHP variable back to ajax

Question

if($rx==$_SESSION['randomx'] and $ry==$_SESSION['randomy']){
 echo "Cestitam, zadeli ste pravilno celico! rabili ste samo:".$_SESSION['poskus'];
}
 else{
 $razdalija=sqrt(($rx-$_SESSION['randomx'])*($rx-$_SESSION['randomx'])+($ry-$_SESSION['randomy'])*($ry-$_SESSION['randomy']));
 echo $_SESSION["poskus"].". Zgresili ste za: ".round($razdalija);
 $_SESSION["poskus"]++;
} 

Both echos return a sentense how can i differenciete those two sentences? In the ajax function i want to compare which one came back so i can set the background color.

• Musa: Instead of returning a string, return structured data like JSON or XML containing meta data on which peace of data was returned.

Answer 1

I would return json instead and use the key to differentiate between the possible outputs.

For example:

$arr = array();
if ($rx==$_SESSION['randomx'] and $ry==$_SESSION['randomy']) {
 $arr['good'] = "Cestitam, zadeli ste pravilno celico! rabili ste samo:".$_SESSION['poskus'];
} else {
 $razdalija=sqrt(($rx-$_SESSION['randomx'])*($rx-$_SESSION['randomx'])+($ry-$_SESSION['randomy'])*($ry-$_SESSION['randomy']));
 $arr['bad'] = $_SESSION["poskus"].". Zgresili ste za: ".round($razdalija);
 $_SESSION["poskus"]++;
}
echo json_encode($arr);

Now you can check in javascript which one is set and do what you want to do.

You could also return an additional value that determines the status and a text value for the text, plenty of possibilities. The key is sending back structured data instead of just a text string.

• user3617642: And then i can use if(data=='bad') and so on?
• jeroen: @user3617642 Not directly, if the json is parsed, you'd use something like if ('bad' in data) or if (data.hasOwnProperty('bad')). And then you use data.bad or data.good which contains the text.
• user3617642: The numbers are undefined, i must be doing something wrong.
• jeroen: @user3617642 What numbers and is the json parsed? You'd need to ask a new question or post the ajax function to get help with this specific problem.