php中英文字符串截取函数(包括html)

这里提供一款支持中文汉字与英文混合在一起的截取功能,包括对html标签等进来处理,下面我们来看看这款截取函数吧.

中英文字符串截取函数(包括html),实例代码如下:

  1. function get_word($string, $length, $dot = '..',$charset='gbk') {
  2. if(strlen($string) <= $length) {
  3. return $string;
  4. }
  5. $string = str_replace(array(' ',' ', '&', '"', '<', '>'), array('','','&', '"', '<', '>'), $string);
  6. $strcut = '';
  7. if(strtolower($charset) == 'utf-8') {
  8. $n = $tn = $noc = 0;
  9. while($n < strlen($string)) {
  10. $t = ord($string[$n]);
  11. if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
  12. $tn = 1; $n++; $noc++;
  13. } elseif(194 <= $t && $t <= 223) {
  14. $tn = 2; $n += 2; $noc += 2;
  15. } elseif(224 <= $t && $t < 239) {
  16. $tn = 3; $n += 3; $noc += 2;
  17. } elseif(240 <= $t && $t <= 247) {
  18. $tn = 4; $n += 4; $noc += 2;
  19. } elseif(248 <= $t && $t <= 251) {
  20. $tn = 5; $n += 5; $noc += 2;
  21. } elseif($t == 252 || $t == 253) {
  22. $tn = 6; $n += 6; $noc += 2;
  23. } else {
  24. $n++;
  25. }
  26. if($noc >= $length) {
  27. break;
  28. }
  29. }
  30. if($noc > $length) {
  31. $n -= $tn;
  32. }
  33. $strcut = substr($string, 0, $n);
  34. } else {
  35. for($i = 0; $i < $length; $i++) {
  36. $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
  37. }
  38. }
  39. return $strcut.$dot;
  40. }
  41. $str = "欢迎 visit 简明 nowamagic";
  42. $str_result = get_word($str, 12);
  43. echo $str_result;