function utf8ToCodepoint( $char ) {
$z = ord( $char{0} );
if ( $z & 0x80 ) {
$length = 0;
while ( $z & 0x80 ) {
$length++;
$z <<= 1;
}
} else {
$length = 1;
}
if ( $length != strlen( $char ) ) {
return false;
}
if ( $length == 1 ) {
return ord( $char );
}
$z &= 0xff;
$z >>= $length;
for ( $i=1; $i<$length; $i++ ) {
$z <<= 6;
$z |= ord( $char{$i} ) & 0x3f;
}
return $z;
}
另外一個是在這裡看到的, 他的功能多一些, 是可以一次轉一整個String到一個Codepoint Array中
function utf8ToUnicode(&$str)
{
$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 (0 == $mState) {
// When mState is zero we expect either a US-ASCII character or a
// multi-octet sequence.
if (0 == (0x80 & ($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;
$mBytes = 6;
} else {
/* Current octet is neither in the US-ASCII range nor a legal first
* octet of a multi-octet sequence.
*/
return false;
}
} else {
// When mState is non-zero, we expect a continuation of the multi-octet
// sequence
if (0x80 == (0xC0 & ($in))) {
// Legal continuation.
$shift = ($mState - 1) * 6;
$tmp = $in;
$tmp = ($tmp & 0x0000003F) << $shift;
$mUcs4 |= $tmp;
if (0 == --$mState) {
/* 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
if [1](2 == $mBytes) && ($mUcs4 < 0x0080 ||
[2]3 == $mBytes) && ($mUcs4 < 0x0800 ||
[3]4 == $mBytes) && ($mUcs4 < 0x10000 ||
(4 < $mBytes) ||
// From Unicode 3.2, surrogate characters are illegal
[4]$mUcs4 & 0xFFFFF800) == 0xD800) ||
// Codepoints outside the Unicode range are illegal
($mUcs4 > 0x10FFFF {
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 {
/* [5]0xC0 & (*in) != 0x80) && (mState != 0
*
* Incomplete multi-octet sequence.
*/
return false;
}
}
}
return $out;
}
兩個都能轉出我要的東西, 而且第二個在Parsing上對我比較方便, 但是自從PHP支援Multibyte function後, 就不這麼重要了, 兩個function拿來轉同樣10個字的String, 第一個只要0.000017秒, 第二個卻要整整三倍多的0.000052秒. 看來, 我應該會用第一個吧.
太久沒有去鑽PHP, 反應變遲鈍了, 唉.