Best practices for implementing a JSON API

I have an embedded PHP script that generates a code that users then put on their websites. I want to open it up to allow them to simply send a request via http and return the code via JSON. The request contains a number of parameters, as does the response.

I'm somewhat familiar with JSON but I'd like some pointers on the best practice way of implementing this type of thing in PHP.

Thanks.
metalaureateAsked:
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hieloCommented:
>>I'm somewhat familiar with JSON but I'd like some pointers on the best practice way of implementing this type of thing in PHP.
There's a function that already does this for you  - json_encode
http://us3.php.net/manual/en/function.json-encode.php

simply pass it an array or an object and it will do the hard work for you.
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metalaureateAuthor Commented:
How do I use it in JS? Do I just eval() the string?
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hieloCommented:
>>How do I use it in JS
You can use eval or you can use a json parser that does not use eval. Refer to:
http://json.org/

particularly:
http://www.json.org/json_parse.js
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metalaureateAuthor Commented:
Thanks.
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