93 lines
2.3 KiB
PHP
93 lines
2.3 KiB
PHP
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<?php
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/**
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* @version $Id$
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* @package utf8
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* @subpackage strings
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*/
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//---------------------------------------------------------------
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/**
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* UTF-8 aware alternative to ord
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* Returns the unicode ordinal for a character
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* @param string UTF-8 encoded character
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* @return int unicode ordinal for the character
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* @see http://www.php.net/ord
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* @see http://www.php.net/manual/en/function.ord.php#46267
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*/
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function utf8_ord($chr) {
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$ord0 = ord($chr);
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if ( $ord0 >= 0 && $ord0 <= 127 ) {
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return $ord0;
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}
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if ( !isset($chr{1}) ) {
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trigger_error('Short sequence - at least 2 bytes expected, only 1 seen');
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return FALSE;
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}
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$ord1 = ord($chr{1});
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if ( $ord0 >= 192 && $ord0 <= 223 ) {
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return ( $ord0 - 192 ) * 64
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+ ( $ord1 - 128 );
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}
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if ( !isset($chr{2}) ) {
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trigger_error('Short sequence - at least 3 bytes expected, only 2 seen');
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return FALSE;
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}
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$ord2 = ord($chr{2});
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if ( $ord0 >= 224 && $ord0 <= 239 ) {
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return ($ord0-224)*4096
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+ ($ord1-128)*64
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+ ($ord2-128);
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}
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if ( !isset($chr{3}) ) {
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trigger_error('Short sequence - at least 4 bytes expected, only 3 seen');
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return FALSE;
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}
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$ord3 = ord($chr{3});
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if ($ord0>=240 && $ord0<=247) {
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return ($ord0-240)*262144
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+ ($ord1-128)*4096
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+ ($ord2-128)*64
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+ ($ord3-128);
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}
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if ( !isset($chr{4}) ) {
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trigger_error('Short sequence - at least 5 bytes expected, only 4 seen');
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return FALSE;
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}
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$ord4 = ord($chr{4});
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if ($ord0>=248 && $ord0<=251) {
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return ($ord0-248)*16777216
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+ ($ord1-128)*262144
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+ ($ord2-128)*4096
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+ ($ord3-128)*64
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+ ($ord4-128);
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}
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if ( !isset($chr{5}) ) {
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trigger_error('Short sequence - at least 6 bytes expected, only 5 seen');
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return FALSE;
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}
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if ($ord0>=252 && $ord0<=253) {
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return ($ord0-252) * 1073741824
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+ ($ord1-128)*16777216
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+ ($ord2-128)*262144
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+ ($ord3-128)*4096
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+ ($ord4-128)*64
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+ (ord($chr{5})-128);
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}
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if ( $ord0 >= 254 && $ord0 <= 255 ) {
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trigger_error('Invalid UTF-8 with surrogate ordinal '.$ord0);
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return FALSE;
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}
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}
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