How can I pass a PHP variable to javascript?

Question

I want to use a PHP variable as a javascript variable - specifically I want to user the PHP variable session_id(); and use this as a javascript variable.

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Answer 1

The best method i can think of looks like this:

PHP's json_encode-function is always producing valid JavaScript, which is not ensured if you are simply outputting random values. If you decide not to use json_encode(), you should at least enclose the php-value with quotes to prevent syntax errors. Be aware of escaping!