How to list all PHP variables in a file?

Question

I have a PHP file with PHP Variables inside.
Example:

Hi ,
Can you please send me an email ?

I would like to

Answer 1

Depending on the expected accuracy a bit token_get_all() traversal will get you a list of variable basenames:

print_r(
    array_filter(
        token_get_all($php_file_content),
        function($t) { return $t[0] == T_VARIABLE; }
    )
);

Just filter out [1] from that array structure.

A bit less resilient, but sometimes still appropriate is a basic regex, which also allows to extract array variable or object syntax more easily.