strstr function

[eluser]PhilTem[/eluser]
Assuming you have a comma only once in your string to search

Code:

$pos_comma = strpos($string_to_search, ',');
$before = substr($string_to_search, 0, $pos_comma - 1);
$after = substr($string_to_search, $pos_comma + 1);

will return everything before the comma (w/o the comma) and after the comma (again w/o the comma)

Edit: Actually this works for more than one comma in your string, but it will split the string according to the position of your first comma. Just to clarify