( string string [, int format [, string charlist]] )
Counts the number of words inside string.
If the optional format is not specified, then
the return value will be an integer representing the number of words
found. In the event the format is specified, the return
value will be an array, content of which is dependent on the
format. The possible value for the
format and the resultant outputs are listed below.
For the purpose of this function, 'word' is defined as a locale dependent
string containing alphabetic characters, which also may contain, but not start
with "'" and "-" characters.