How to get true or false from PHP function using AJAX?

Question

I tested status.php return value with var_dump($result) and alerted it out in check() function like this:

function check() {
    $.ajax({
               


        

Answer 1

You're not sending the return value of the status() function back to PHP. Use:

echo json_encode(status());

And change the AJAX call to expect a JSON response.

function check() {
    $.ajax({
        url: "status.php",
        dataType: 'json'
    }).done(function(data) {
        alert(data);
    });
}

Answer 2

Ajax may not be returning a boolean true or false, rather a string.

So try and put true in double quotes:

if(data=="true")

You can also use the trim function on data to ensure no whitespace is present in the returned data, like so:

if($.trim(data)=="true")

Answer 3

you just echo the $result like this

ajax not returning value so that we have to echo it.

 <?php function status(){
if(logged() === true) {
    $result = true;
} else {
    $result = false;
}
echo $result;  } status();  ?>

and then should be like this

function check() {
$.ajax({
    url: "status.php"
}).done(function(data) {
    if(data == "true"){
        alert("true");
    } else {
        alert("false");
    }
});   }

Answer 4

Just Remove Type checking i.e '===' replace with '=='

function check() {
    $.ajax({
        url: "status.php"
    }).done(function(data) {
        if(data == true){
            alert("true");
        } else {
            alert("false");
        }
    });
}

Answer 5

Use

**dataType: 'json'** 
function check() {
    $.ajax({
        url: "status.php",
        dataType: 'json'
    }).done(function(data) {
        alert(data);
    });
}

and on status.php use

echo json_encode(status()); 

Answer 6

You cannot get the response by return method in ajax. to get value "echo" whatever the result in the function , like

function status(){
    if(logged() === true) {
        $result = "1";
    } else {
        $result = "0";
    }
    echo $result;exit;
}

you will get the value 1 or 0 in your ajax success function