PHP数组返回null

Question

I have a html form with a button on which there is a onclick event

    <form id = "abc" action = "xyz.php" method = "post">
      <input type="button" name="submitButton" value="Submit" 
            id="submitButton" onclick = "Function()">
     </form>

In the JS code, I am trying to post a value of a textbox and trying to get the array from the PHP through json_encode.

var valueToSend = $('#textbox').val();
var imagesReturned = new Array();
$.ajax({
        url: "xyz.php",
        type: "POST",
        data: valueToSend,
        dataType:"json",
        success: function(result) {        
            var data = jQuery.parseJSON(result);
            alert(data);
        }
    });

And here is my PHP code,

        if(isset($_POST['valueToSend'])) 
        {
            $searchValues = explode(' ',$_POST['valueToSend']);
           // Some processing here
            echo (json_encode($responseArray));

        }

When I alert the data, I get null, What am I missing?

Thanks!

Answer 1

The problem was in the PHP code.

I removed the check, if(isset($_POST['valueToSend'])) and its working...