php json_encode for php < 5.4 (unexpected token)

Question

I have a jquery ajax which invokes a php file which outputs a json object.

It all works great on versions of php higher than 5.3, but lower versions don't have JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, and JSON_UNESCAPED_UNICODE implemented yet.

How do I escape "json sensitive" chars like "&" or "=" in earlier versions?

Thank you for your time!

EDIT: scratch that.. the problem is => i have <br /> in the text and that gets changed to <br \=""> the " gives the error...

I'm pretty sure & and = are treated as normal characters in JSON, you're probably thinking of URLs. — Jimmy Sawczuk
– Jimmy Sawczuk, Commented Jun 7, 2012 at 19:30
no, i get the "SyntaxError: Unexpected token =" error when parsing.. same goes for "&" — Andrej
– Andrej, Commented Jun 7, 2012 at 19:33
@Andrej json_decode(json_encode('<br />')) === '<br />' — So what exactly are you doing? — Gumbo
– Gumbo, Commented Jun 7, 2012 at 20:06

Ryan · Accepted Answer · 2012-06-07 19:57:29Z

1

If you're using UTF-8 Encoding, you can use this:

$json = preg_replace('/[^(\x20-\x7F)]*/','', $json);

For JSON_UNESCAPED_SLAHES, you can use:

preg_replace('\\/', '/', $json);

JSON_UNESCAPED_UNICODE might be a bit more complicated, I found some examples on php.net manual here.

edited Jun 7, 2012 at 19:57

answered Jun 7, 2012 at 19:30

Ryan

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