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PHP interception string function, PHP custom string interception method

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Release： 2016-07-25 08:51:45
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  2. /**
  3. * 方法库-截取字符串
  4. * @param string $string 字符串
  5. * @param int$length 字符长度
  6. * @param string $dot 截取后是否添加...
  7. * @param string $charset编码
  8. * @return string
  9. */
  10. public function cutstr($string, $length, $dot = ' ...', $charset = 'utf-8') {
  11. if (strlen($string) <= $length) {
  12. return $string;
  13. }
  14. $string = str_replace(array('&', '"', '<', '>'), array('&', '"', '<', '>'), $string);
  15. $strcut = '';
  16. if (strtolower($charset) == 'utf-8') {
  17. $n = $tn = $noc = 0;
  18. while ($n < strlen($string)) {
  19. $t = ord($string[$n]); //ASCII?
  20. if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
  21. $tn = 1; $n++; $noc++;
  22. } elseif (194 <= $t && $t <= 223) {
  23. $tn = 2; $n += 2; $noc += 2;
  24. } elseif (224 <= $t && $t < 239) {
  25. $tn = 3; $n += 3; $noc += 2;
  26. } elseif (240 <= $t && $t <= 247) {
  27. $tn = 4; $n += 4; $noc += 2;
  28. } elseif (248 <= $t && $t <= 251) {
  29. $tn = 5; $n += 5; $noc += 2;
  30. } elseif ($t == 252 || $t == 253) {
  31. $tn = 6; $n += 6; $noc += 2;
  32. } else {
  33. $n++;
  34. }
  35. if($noc >= $length) {
  36. break;
  37. }
  38. }
  39. if ($noc > $length) {
  40. $n -= $tn;
  41. }
  42. $strcut = substr($string, 0, $n);
  43. } else {
  44. for ($i = 0; $i < $length; $i++) {
  45. $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
  46. }
  47. }
  48. $strcut = str_replace(array('&', '"', '<', '>'), array('&', '"', '<', '>'), $strcut);
  49. return $strcut.$dot;
  50. }
复制代码

例2，php检测字符串是否存在：

  2. /**
  3. * 方法库-字符串是否存在
  4. * @param string $str :字符或字符串
  5. * @param string $string :字符串
  6. * @return string 例子: $str='34' $string='1234' 返回 TRUE
  7. */
  8. public function is_str_exist($str, $string) {
  9. $string = (string) $string;
  10. $str = (string) $str;
  11. return strstr($string,$str)===false ? false : true;
  12. }
复制代码


Related labels：
php截取字符串函数，php自定义字符串截取方法
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