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.