Return part of the string.
Twine\Str::substring( int $start [, int $length = null ] ) : Twine\Str| $start | Starting position of the substring |
| $length | Length of substring |
$string = new Twine\Str('john pinkerton');
$string->substring(5, 4); // Returns 'pink'
Twine\Str::first($count)
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= |
Twine\Str::substring(0, $count)
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Twine\Str::last($count)
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= |
Twine\Str::substring(-$count)
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