用于utf8编码的字符串截取的函数
时间：2021-07-01 10:21:17
帮助过：26人阅读
/* - * 用于utf8编码的字符串截取
- */
- function utf8_substr($str,$position,$length){
- $start_position = strlen($str);
- $start_byte = 0;
- $end_position = strlen($str);
- $count = 0;
- for($i = 0; $i < strlen($str); $i++){
- if($count >= $position && $start_position > $i){
- $start_position = $i;
- $start_byte = $count;
- }
- if(($count-$start_byte)>=$length) {
- $end_position = $i;
- break;
- }
- $value = ord($str[$i]);
- if($value > 127){
- $count++;
- if($value >= 192 && $value <= 223) $i++;
- elseif($value >= 224 && $value <= 239) $i = $i + 2;
- elseif($value >= 240 && $value <= 247) $i = $i + 3;
- else die('Not a UTF-8 compatible string');
- }
- $count++;
} - return(substr($str,$start_position,$end_position-$start_position));
- }
- ?>
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