php - How do I create a function to add to existing information? -

i have existing code has string of words. need able create function add existing string of words. struggling how in php. new , have looked has gotten me nowhere.

when said , done, like:

a function add new word existing variable contains string of words. (below existing code of words)

$words = 'apple sauce, tasty chicken, new monkey, left right'; 

below can come with:

function newword($word){    $newalpha = 'time table';    if ($newalpha > 0){       echo $newalpha => $words;    } } 

i know that's not right i'm new php , mysql. may worth noting need function inserted database $words housed, bonus if me that.

just concatenate string:

function newword($word, $words){    if($word != ''){//or other check want        return "$words, $word";     }    return $words; } 

usage:

$newalpha = 'time table'; $words = newword($newalpha,$words);//now $words has $newalpha appended onto end comma , space 

you can see in action here:

http://sandbox.onlinephpfunctions.com/code/436189dc45208fb78bdfa4262772600559f29d44