3 * This was an experiment to see how a PCRE based UTF-8 to unicode
4 * code point converter would perform, vs. a character by character
5 * converted (as in '../utf8_unicode.php'). Basically this is very
6 * by comparion but perhaps interesting code anyway
9 '([\x09\x0A\x0D\x20-\x7E])'. # ASCII (excluding control chars)
10 '|([\xC2-\xDF][\x80-\xBF]'. # non-overlong 2-byte
11 '|\xE0[\xA0-\xBF][\x80-\xBF])'. # excluding overlongs
12 '|([\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}'. # straight 3-byte
13 '|\xED[\x80-\x9F][\x80-\xBF]'. # excluding surrogates
14 '|\xF0[\x90-\xBF][\x80-\xBF]{2}'. # planes 1-3
15 '|[\xF1-\xF3][\x80-\xBF]{3}'. # planes 4-15
16 '|\xF4[\x80-\x8F][\x80-\xBF]{2})'; # plane 16
17 '|(.{1})'; # catch bad bytes
19 function toCodePoint($matches) {
21 if ( $matches[1] != '' ) {
22 $points[]= ord($matches[1]);
23 } else if ( $matches[2] != '' ) {
24 $points[]= ( ( ord($matches[2][0]) % 32 ) * 64 ) + ( ord($matches[2][1]) % 64 );
25 } else if ( $matches[3] != '' ) {
26 $points[]= ( ( ord($matches[3][0]) % 16 ) * 4096 ) + ( ( ord($matches[3][1]) % 64 ) * 64 ) + ( ord($matches[3][2]) % 64 );
27 } else if ( $matches[4] != '' ) {
28 trigger_error('Invalid byte in UTF-8',E_USER_WARNING);
34 $str = file_get_contents('../tests/data/utf8.html');
36 preg_replace_callback('/'.$UTF8_MATCH.'/S','toCodePoint',$str);