PHP切割汉字的常用方法实例总结

php  /  管理员 发布于 7年前   199

本文实例讲述了PHP切割汉字的常用方法。分享给大家供大家参考，具体如下：

 0xa0)  //ord()函数返回字符串的第一个字符的ASCII值    {      $tmpstr .= substr($str, $i, 2);      $i++;    } else {      $tmpstr .= substr($str, $i, 1);    }  }  return $tmpstr;}/*----------------------------第二种方法-----------------------------------*///截取的是UTF-8字符串function utf_substr($str, $len){  $new_str = [];  for ($i = 0; $i < $len; $i++) {    $tem_str = substr($str, 0, 1);    if (ord($tem_str > 127)) {      $i++;      if ($i < $len) {        $new_str[] = substr($str, 0, 3);        $str = substr($str, 3);      }    } else {      $new_str[] = substr($str, 0, 1);      $str = substr($str, 1);    }  }  return join($new_str);//join()函数把数组元素组合为一个字符串}/*-------------------------------------第三种方法(UTF-8)--------------------------------*/function cutstr($string, $length){  preg_match_all("/[\x01-\x7f]|[\xc2-\xdf]|[\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/", $string, $info);  $wordscut = "";  $j = 0;  for ($i = 0; $i < count($info[0]); $i++) {    $wordscut .= $info[0][$i];    $j = ord($info[0][$i]) > 127 ? $j + 2 : $j + 1;    if ($j > $length - 3) {      return $wordscut . "...";    }  }  return join('', $info[0]);}$string = "312哈哈，这个组合很难切割哦";echo cutstr($string, 10);/*---------------------------------下面是曾经用过的截取第三个的字符串的------------------------------*/// $name1 = mysql_result($my_rst,0,"name");// $name = preg_match("/([1-9][0-9]+)/",$name1,$r);// $name = $r[0];// if($name == ""){// $name=preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,2}'.// '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,1}).*#s',// '$1',$name1);// }/*--------------------------------------------第四种方法(UTF-8)---------------------------------------------*/function cut_str($sourcestr, $cutlength){  $returnstr = '';  $i = 0;  $n = 0;  $str_length = strlen($sourcestr);//字符串的字节数  while ($n < $cutlength && $i <= $str_length) {    $temp_str = substr($sourcestr, $i, 1);    $ascnum = ord($temp_str);//得到字符串中第$i位字符的ASCII码    if ($ascnum >= 224) {      $returnstr = $returnstr . substr($sourcestr, $i, 3);//根据UTF-8编码规范，将3个连续的字符计为单个字符      $i = $i + 3;//实际Byte记为3      $n++;//字串长度为1    } elseif ($ascnum >= 192)//如果ASCII位高于192    {      $returnstr = $returnstr . substr($sourcestr, $i, 2);//根据UTF-8编码规范，将2个连续的字符记为单个字符      $i = $i + 2;//实际Byte记为2      $n++;//字串长度为1    } elseif ($ascnum >= 65 && $ascnum <= 90)//如果是大写字母    {      $returnstr = $returnstr . substr($sourcestr, $i, 1);      $i = $i + 1;//byte记为1      $n++;//但考虑到整体美观，大写字母计成一个高位字符    } else {      $returnstr = $returnstr . substr($sourcestr, $i, 1);      $i = $i + 1;//实际的Byte记为1      $n = $n + 0.5;//小写字母和半角标点等与半个高位字符宽...    }  }  if ($str_length > $cutlength) {    $returnstr = $returnstr . "...";//超过长度时在尾处加上省略号  }  return $returnstr;}/*--------------------第五种方法（UTF-8）---------------------------------------------*/function FSubstr($title, $start, $len = "", $magic = true){  if ($len == "") $len = strlen($title);  if ($start != 0) {    $startv = ord(substr($title, $start, 1));    if ($startv >= 128) {      if ($startv < 192) {        for ($i = $start - 1; $i > 0; $i--) {          $tempv = ord(substr($title, $i, 1));          if ($tempv >= 192) break;        }        $start = $i;      }    }  }  if (strlen($title) <= $len) return substr($title, $start, $len);  $alen = 0;  $blen = 0;  $realnum = 0;  $length = 0;  for ($i = $start; $i < strlen($title); $i++) {    $ctype = 0;    $cstep = 0;    $cur = substr($title, $i, 1);    if ($cur == "&") {      if (substr($title, $i, 4) == "<") {        $cstep = 4;        $length += 4;        $i += 3;        $realnum++;        if ($magic) {          $alen++;        }      } elseif (substr($title, $i, 4) == ">") {        $cstep = 4;        $length += 4;        $i += 3;        $realnum++;        if ($magic) {          $alen++;        }      } elseif (substr($title, $i, 5) == "&") {        $cstep = 5;        $length += 5;        $i += 4;        $realnum++;        if ($magic) {          $alen++;        }      } elseif (substr($title, $i, 6) == """) {        $cstep = 6;        $length += 6;        $i += 5;        $realnum++;        if ($magic) {          $alen++;        }      } elseif (preg_match("/(\d+);?/i", substr($title, $i), $match)) {        $cstep = strlen($match[0]);        $length += strlen($match[0]);        $i += strlen($match[0]) - 1;        $realnum++;        if ($magic) {          $blen++;          $ctype = 1;        }      }    } else {      if (ord($cur) >= 252) {        $cstep = 6;        $length += 6;        $i += 5;        $realnum++;        if ($magic) {          $blen++;          $ctype = 1;        }      } elseif (ord($cur) >= 248) {        $cstep = 5;        $length += 5;        $i += 4;        $realnum++;        if ($magic) {          $ctype = 1;          $blen++;        }      } elseif (ord($cur) >= 240) {        $cstep = 4;        $length += 4;        $i += 3;        $realnum++;        if ($magic) {          $blen++;          $ctype = 1;        }      } elseif (ord($cur) >= 224) {        $cstep = 3;        $length += 3;        $i += 2;        $realnum++;        if ($magic) {          $ctype = 1;          $blen++;        }      } elseif (ord($cur) >= 192) {        $ctype = 2;        $length += 2;        $i += 1;        $realnum++;        if ($magic) {          $blen++;          $ctype = 1;        }      } elseif (ord($cur) >= 128) {        $length += 1;      } else {        $cstep = 1;        $length += 1;        $realnum++;        if ($magic) {          if (ord($cur) >= 65 && ord($cur) <= 90) {$blen++;          } else {$alen++;          }        }      }    }    if ($magic) {      if (($blen * 2 + $alen) == ($len * 2)) break;      if (($blen * 2 + $alen) == ($len * 2) + 1) {        if ($ctype == 1) {          $length -= $cstep;          break;        } else {          break;        }      }    } else {      if ($realnum == $len) break;    }  }  unset($cur);  unset($alen);  unset($blen);  unset($realnum);  unset($ctype);  unset($cstep);  return substr($title, $start, $length);}function utf8Substr($str, $from, $len){  return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,' . $from . '}' .    '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,' . $len . '}).*#s',    '$1', $str);}$title = "你哈珀niad1纳斯达wop asdni你爱谁都没阿斯顿撒旦12ccs- sd";$title = utf8Substr($title, 0, 15);echo $title;?>

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