Function _shorten

Shorten a string for the given length

Package: PHPLucidFrame\Core
Copyright: Copyright (c), PHPLucidFrame.
License: MIT License This source file is subject to the MIT license that is bundled with this source code in the file LICENSE
Author: Sithu sithu@phplucidframe.com
Located at helpers/utility_helper.php

Parameters summary
`string`	`$str`	A plain text string to be shorten
`integer`	`$length = 50`	The character count
`boolean`	`$trail = '...'`	To append <code>...</code> or not. <code>null</code> to not show

Return value summary
`string`	The shortent text string