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【PHP】 utf8到unicode
作者:亭 / 发布于2014/11/11/ 771

	function utf8_to_unicode($str)
	{//来自：<a href="http://www.cnblogs.com/niniwzw/archive/2010/12/17/1909534.html">http://www.cnblogs.com/niniwzw/archive/2010/12/17/1909534.html
	 $mState = 0; // cached expected number of octets after the current octet
	 // until the beginning of the next UTF8 character sequence
	 $mUcs4 = 0; // cached Unicode character
	 $mBytes = 1; // cached expected number of octets in the current sequence

	 $out = array();

	 $len = strlen($str);

	 for($i = 0; $i < $len; $i++) {

	 $in = ord($str{$i});

	 if ( $mState == 0) {

	 // When mState is zero we expect either a US-ASCII character or a
	 // multi-octet sequence.
	 if (0 == (0x80 & ($in))) {
	 // US-ASCII, pass straight through.
	 $out[] = $in;
	 $mBytes = 1;

	 } else if (0xC0 == (0xE0 & ($in))) {
	 // First octet of 2 octet sequence
	 $mUcs4 = ($in);
	 $mUcs4 = ($mUcs4 & 0x1F) << 6;
	 $mState = 1;
	 $mBytes = 2;

	 } else if (0xE0 == (0xF0 & ($in))) {
	 // First octet of 3 octet sequence
	 $mUcs4 = ($in);
	 $mUcs4 = ($mUcs4 & 0x0F) << 12;
	 $mState = 2;
	 $mBytes = 3;

	 } else if (0xF0 == (0xF8 & ($in))) {
	 // First octet of 4 octet sequence
	 $mUcs4 = ($in);
	 $mUcs4 = ($mUcs4 & 0x07) << 18;
	 $mState = 3;
	 $mBytes = 4;

	 } else if (0xF8 == (0xFC & ($in))) {
	 /* 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.
	 */
	 $mUcs4 = ($in);
	 $mUcs4 = ($mUcs4 & 0x03) << 24;
	 $mState = 4;
	 $mBytes = 5;

	 } else if (0xFC == (0xFE & ($in))) {
	 // First octet of 6 octet sequence, see comments for 5 octet sequence.
	 $mUcs4 = ($in);
	 $mUcs4 = ($mUcs4 & 1) << 30;
	 $mState = 5;
	 $mBytes = 6;

	 } else {
	 /* Current octet is neither in the US-ASCII range nor a legal first
	 * octet of a multi-octet sequence.
	 */
	 trigger_error(
	 'utf8_to_unicode: Illegal sequence identifier '.
	 'in UTF-8 at byte '.$i,
	 E_USER_WARNING
	 );
	 return FALSE;

	 }

	 } else {

	 // When mState is non-zero, we expect a continuation of the multi-octet
	 // sequence
	 if (0x80 == (0xC0 & ($in))) {

	 // Legal continuation.
	 $shift = ($mState - 1) * 6;
	 $tmp = $in;
	 $tmp = ($tmp & 0x0000003F) << $shift;
	 $mUcs4 |= $tmp;

	 /**
	 * End of the multi-octet sequence. mUcs4 now contains the final
	 * Unicode codepoint to be output
	 */
	 if (0 == --$mState) {

	 /*
	 * Check for illegal sequences and codepoints.
	 */
	 // From Unicode 3.1, non-shortest form is illegal
	 if (((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
	 ((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
	 ((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
	 (4 < $mBytes) ||
	 // From Unicode 3.2, surrogate characters are illegal
	 (($mUcs4 & 0xFFFFF800) == 0xD800) ||
	 // Codepoints outside the Unicode range are illegal
	 ($mUcs4 > 0x10FFFF)) {

	 trigger_error(
	 'utf8_to_unicode: Illegal sequence or codepoint '.
	 'in UTF-8 at byte '.$i,
	 E_USER_WARNING
	 );

	 return FALSE;

	 }

	 if (0xFEFF != $mUcs4) {
	 // BOM is legal but we don't want to output it
	 $out[] = $mUcs4;
	 }

	 //initialize UTF8 cache
	 $mState = 0;
	 $mUcs4 = 0;
	 $mBytes = 1;
	 }

	 } else {
	 /**
	 *((0xC0 & (*in) != 0x80) && (mState != 0))
	 * Incomplete multi-octet sequence.
	 */
	 trigger_error(
	 'utf8_to_unicode: Incomplete multi-octet '.
	 ' sequence in UTF-8 at byte '.$i,
	 E_USER_WARNING
	 );

	 return FALSE;
	 }
	 }
	 }
	 return $out;
	}
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