`isWhitespace`

Determine if the string is composed of alphabetic characters.

php

Twine\Str::isWhitespace() : bool

Examples

php

$string = new Twine\Str(" \r\n\t");

$string->isWhitespace(); // Returns true

php

$string = new Twine\Str('john pinkerton');

$string->isWhitespace(); // Returns false