How to convert array to string, and vice versa

I have some items, numbered from 0 upwards. Some of them may have a
string attached. All these items need to be represented in a single
already existing database record. So, I thought of taking an array, as
it might be looking thus (the values are all strings):

Key Value
--- -----
0 firstone
2 somestring
5 anotherstr


and so on, and converting it to a single string:

"'0', 'firstone', '2', 'somestring', '5', 'anotherstr'"

then I have a string I can write to the database record.

So I want to go from:

$myarr = array (0 => 'firstone', 2 => 'somestring', 5 => 'anotherstr');

to:

$mystring = "'0', 'firstone', '2', 'somestring', '5', 'anotherstr'";

Is there a quick way to do this mapping in both directions? (I don't
mind if the string read/written to the database is not as above, as it
won't be used for any other purpose).

I can't see any array or string function that looks designed for this or
a similar purpose.

Thanks for any pointers.

-- tim
.

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