Fastest way to implode an associative array with keys

Question

I\'m looking for a fast way to turn an associative array in to a string. Typical structure would be like a URL query string but with customizable separators so I can use \'<

Answer 1

echo implode(",", array_keys($companies->toArray()));

$companies->toArray() -- this is just in case if your $variable is an object, otherwise just pass $companies.

That's it!