Function utf8_is_valid
Tests a string as to whether it's valid UTF-8 and supported by the Unicode standard Note: this function has been modified to simple return true or false
		
		Package: utf8
Author: <hsivonen@iki.fi>
See: http://hsivonen.iki.fi/php-utf8/
See:
Located at vendor/joomla/string/src/phputf8/utils/validation.php
	
	Author: <hsivonen@iki.fi>
See: http://hsivonen.iki.fi/php-utf8/
See:
utf8_compliant()Located at vendor/joomla/string/src/phputf8/utils/validation.php
Parameters summary
| string | $str | UTF-8 encoded string | 
Return value summary
| 
			boolean
		 | true if valid | 
