Question

I have a PHP single dimension array, when using the json_encode function on that array I get a json object returned but it has a leading 0 before the opening curly brace {.

0{"a1000":"b1000","a1200":"b1200"}

The PHP array is:

Array
(
    [a1000] => b1000
    [a1200] => b1200
)

On the same page, with a different (but same structured) request, the json object that is returned does not have a leading 0.

The error in the Chrome console is:

Uncaught SyntaxError: Unexpected token {

Has anyone ever come across this problem before?

Answer 1

Your PHP is likely outputting the 0 before the JSON. Although you didn’t show all you code, you should double check all of the following:

• check there’s no text before your <?php tag
• look for any rogue echo or print statements
• check that you’re not using outputting functions such as readfile() or var_dump()