PHP echo javascript with PHP variable

Question

I am currently displaying javascript via PHP echo:

        echo 'var currentInvoiceDataJSON = <?php echo json_encode($yearData_Invoices[$currentYear] ); ?>;';

However I get a Uncaught SyntaxError: Unexpected token < error which I infer is related to the second

How can I get this resolved and there any other possibilities?

Some expert advise would be appreciated.

Answer 1

That code ends as invalid Javascript code.

Here's what happens:

Your server echoes a string:

echo 'var currentInvoiceDataJSON = <?php echo json_encode($yearData_Invoices[$currentYear] ); ?>;';

Your browser now has:

var currentInvoiceDataJSON = <?php echo json_encode($yearData_Invoices[$currentYear] ); ?>;

Once your PHP script finishes running and echoes that first string, PHP cannot process the inner echo.

---

What I would do:

$data = json_encode($yearData_Invoices[$currentYear]);
echo 'var currentInvoiceDataJSON = ' . $data . ';';

Answer 2

改为这样做：

echo 'var currentInvoiceDataJSON = '.<?php echo json_encode($yearData_Invoices[$currentYear] ); ?>.';';

Answer 3

我没有测试过，但可以尝试一下：

echo "var currentInvoiceDataJSON = '".str_replace("'","\\'",json_encode($yearData_Invoices[$currentYear]))."';";

Answer 4

just change to

echo "var currentInvoiceDataJSON = ".json_encode($yearData_Invoices[$currentYear] ).";";

and also be aware that single quoted strings in php don't interpolate variables so

$a = "Hello World";
echo '$a'; // outputs :  $a
echo "$a"; // outputs :  Hello World

and when you are in a php context