Why won't JSON accept my PHP variable?

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I can't get the jQuery.ajax call to use my PHP string variable $defaultTicker. I have tried encoding to utf8 and trimming any type of "special" characters, yet nothing has helped. If I view the page source, I see a valid JSON array: { "ticker":"SPY", "startDay":1, "endDay":30}.

Here is my jQuery to submit the data:

    $.ajax({
            url: "findCorrelated.php",
            // WHY DOESN'T <?=$defaultTicker?> work???
            data: { "ticker":"<?=$defaultTicker?>", "startDay":1, "endDay":30},
            success: function(data){
                $('#testParagraph').show();
                $('#testParagraph').html(data);
            }
        });

Any ideas as to why it is failing to submit using the PHP variable? If I hardcode "SPY" in place of "", it will succeed. However, when viewing the source, the results appear to be the same.

Note: I am not using json_encode on a php array, because the startDay and endDay values are going to come from the client-side javascript.

asked 21 secs ago

user3058025

1