english/libraries/joomla/utilities/string.php
/**
	 * 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
	 *
	 * @param   string   $str  UTF-8 encoded string
	 *
	 * @return  boolean  true if valid
	 *
	 * @author  <hsivonen@iki.fi>
	 * @see     http://hsivonen.iki.fi/php-utf8/
	 * @see     compliant
	 * @since   11.1
	 */
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

@param   string   $str  UTF-8 encoded string

@return  boolean  true if 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 @param string $str UTF - 8 encoded string @return boolean true if valid
public static function valid($str)
	{
		$mState = 0;
		$mUcs4  = 0;
		$mBytes = 1;
		$len = strlen($str);
		for ($i = 0; $i < $len; $i++)
		{
			$in = ord($str{$i});
			if ($mState == 0)
			{
				if (0 == (0x80 & ($in))) {
					$mBytes = 1;
				} else if (0xC0 == (0xE0 & ($in))) {
					$mUcs4 = ($in);
					$mUcs4 = ($mUcs4 & 0x1F) << 6;
					$mState = 1;
					$mBytes = 2;
				} else if (0xE0 == (0xF0 & ($in))) {
					$mUcs4 = ($in);
					$mUcs4 = ($mUcs4 & 0x0F) << 12;
					$mState = 2;
					$mBytes = 3;
				} else if (0xF0 == (0xF8 & ($in))) {
					$mUcs4 = ($in);
					$mUcs4 = ($mUcs4 & 0x07) << 18;
					$mState = 3;
					$mBytes = 4;
				} else if (0xF8 == (0xFC & ($in))) {
					$mUcs4 = ($in);
					$mUcs4 = ($mUcs4 & 0x03) << 24;
					$mState = 4;
					$mBytes = 5;
				} else if (0xFC == (0xFE & ($in))) {
					$mUcs4 = ($in);
					$mUcs4 = ($mUcs4 & 1) << 30;
					$mState = 5;
					$mBytes = 6;
				} else {
					return FALSE;
				}
			}
			else
			{
				if (0x80 == (0xC0 & ($in)))
				{
					$shift = ($mState - 1) * 6;
					$tmp = $in;
					$tmp = ($tmp & 0x0000003F) << $shift;
					$mUcs4 |= $tmp;
					if (0 == --$mState)
					{
						if (((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
							((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
							((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
							(4 < $mBytes) ||
							(($mUcs4 & 0xFFFFF800) == 0xD800) ||
							($mUcs4 > 0x10FFFF)) {
								return FALSE;
							}
						$mState = 0;
						$mUcs4  = 0;
						$mBytes = 1;
					}
				}
				else
				{
					return FALSE;
				}
			}
		}
		return TRUE;
	}
public static function valid ( $ str ) { $ mState = 0 ; $ mUcs4 = 0 ; $ mBytes = 1 ; $ len = strlen ( $ str ) ; for ( $ i = 0 ; $ i < $ len ; $ i ++ ) { $ in = ord ( $ str { $ i } ) ; if ( $ mState == 0 ) { if ( 0 == ( 0x80 & ( $ in ) ) ) { $ mBytes = 1 ; } else if ( 0xC0 == ( 0xE0 & ( $ in ) ) ) { $ mUcs4 = ( $ in ) ; $ mUcs4 = ( $ mUcs4 & 0x1F ) << 6 ; $ mState = 1 ; $ mBytes = 2 ; } else if ( 0xE0 == ( 0xF0 & ( $ in ) ) ) { $ mUcs4 = ( $ in ) ; $ mUcs4 = ( $ mUcs4 & 0x0F ) << 12 ; $ mState = 2 ; $ mBytes = 3 ; } else if ( 0xF0 == ( 0xF8 & ( $ in ) ) ) { $ mUcs4 = ( $ in ) ; $ mUcs4 = ( $ mUcs4 & 0x07 ) << 18 ; $ mState = 3 ; $ mBytes = 4 ; } else if ( 0xF8 == ( 0xFC & ( $ in ) ) ) { $ mUcs4 = ( $ in ) ; $ mUcs4 = ( $ mUcs4 & 0x03 ) << 24 ; $ mState = 4 ; $ mBytes = 5 ; } else if ( 0xFC == ( 0xFE & ( $ in ) ) ) { $ mUcs4 = ( $ in ) ; $ mUcs4 = ( $ mUcs4 & 1 ) << 30 ; $ mState = 5 ; $ mBytes = 6 ; } else { return FALSE ; } } else { if ( 0x80 == ( 0xC0 & ( $ in ) ) ) { $ shift = ( $ mState - 1 ) * 6 ; $ tmp = $ in ; $ tmp = ( $ tmp & 0x0000003F ) << $ shift ; $ mUcs4 |= $ tmp ; if ( 0 == -- $ mState ) { if ( ( ( 2 == $ mBytes ) && ( $ mUcs4 < 0x0080 ) ) || ( ( 3 == $ mBytes ) && ( $ mUcs4 < 0x0800 ) ) || ( ( 4 == $ mBytes ) && ( $ mUcs4 < 0x10000 ) ) || ( 4 < $ mBytes ) || ( ( $ mUcs4 & 0xFFFFF800 ) == 0xD800 ) || ( $ mUcs4 > 0x10FFFF ) ) { return FALSE ; } $ mState = 0 ; $ mUcs4 = 0 ; $ mBytes = 1 ; } } else { return FALSE ; } } } return TRUE ; }
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
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
// Cached expected number of octets after the current octet // until the beginning of the next UTF8 character sequence // Cached Unicode character // Cached expected number of octets in the current sequence // When mState is zero we expect either a US-ASCII character or a // multi-octet sequence. // US-ASCII, pass straight through. // First octet of 2 octet sequence // First octet of 3 octet sequence // First octet of 4 octet sequence /* First octet of 5 octet sequence.
					 *
					 * This is illegal because the encoded codepoint must be either
					 * (a) not the shortest form or
					 * (b) outside the Unicode range of 0-0x10FFFF.
					 * Rather than trying to resynchronize, we will carry on until the end
					 * of the sequence and let the later error handling code catch it.
					 */ // First octet of 6 octet sequence, see comments for 5 octet sequence. /* Current octet is neither in the US-ASCII range nor a legal first
					 * octet of a multi-octet sequence.
					 */ // When mState is non-zero, we expect a continuation of the multi-octet // sequence // Legal continuation. /**
					 * End of the multi-octet sequence. mUcs4 now contains the final
					 * Unicode codepoint to be output
					 */ /*
						 * Check for illegal sequences and codepoints.
						 */ // From Unicode 3.1, non-shortest form is illegal // From Unicode 3.2, surrogate characters are illegal // Codepoints outside the Unicode range are illegal // Initialize UTF8 cache. /**
					 *((0xC0 & (*in) != 0x80) && (mState != 0))
					 * Incomplete multi-octet sequence.
					 */