<?php/*@UTF-8編碼的字符可能由1~3個字節組成。*//*--------------------------方法一截取中文字符串方法------------------------------*/function msubstr($str, $start, $len){  $tmpstr = "";  $strlen = $start + $len;  for ($i = 0; $i < $strlen; $i++) {    if (ord(substr($str, $i, 1)) > 0xa0)  //ord()函數返回字符串的第一個字符的ASCII值    {      $tmpstr .= substr($str, $i, 2);      $i++;    } else {      $tmpstr .= substr($str, $i, 1);    }  }  return $tmpstr;}/*----------------------------第二種方法-----------------------------------*///截取的是UTF-8字符串function utf_substr($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($new_str);//join()函數把數組元素組合為一個字符串}/*-------------------------------------第三種方法(UTF-8)--------------------------------*/function cutstr($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，這個組合很難切割哦";echo cutstr($string, 10);/*---------------------------------下面是曾經用過的截取第三個的字符串的------------------------------*/// $name1 = mysql_result($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);// }/*--------------------------------------------第四種方法(UTF-8)---------------------------------------------*/function cut_str($sourcestr, $cutlength){  $returnstr = '';  $i = 0;  $n = 0;  $str_length = strlen($sourcestr);//字符串的字節數  while ($n < $cutlength && $i <= $str_length) {    $temp_str = substr($sourcestr, $i, 1);    $ascnum = ord($temp_str);//得到字符串中第$i位字符的ASCII碼    if ($ascnum >= 224) {      $returnstr = $returnstr . substr($sourcestr, $i, 3);//根據UTF-8編碼規范，將3個連續的字符計為單個字符      $i = $i + 3;//實際Byte記為3      $n++;//字串長度為1    } elseif ($ascnum >= 192)//如果ASCII位高于192    {      $returnstr = $returnstr . substr($sourcestr, $i, 2);//根據UTF-8編碼規范，將2個連續的字符記為單個字符      $i = $i + 2;//實際Byte記為2      $n++;//字串長度為1    } elseif ($ascnum >= 65 && $ascnum <= 90)//如果是大寫字母    {      $returnstr = $returnstr . substr($sourcestr, $i, 1);      $i = $i + 1;//byte記為1      $n++;//但考慮到整體美觀，大寫字母計成一個高位字符    } else {      $returnstr = $returnstr . substr($sourcestr, $i, 1);      $i = $i + 1;//實際的Byte記為1      $n = $n + 0.5;//小寫字母和半角標點等與半個高位字符寬...    }  }  if ($str_length > $cutlength) {    $returnstr = $returnstr . "...";//超過長度時在尾處加上省略號  }  return $returnstr;}/*--------------------第五種方法（UTF-8）---------------------------------------------*/function FSubstr($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納斯達wop asdni你愛誰都沒阿斯頓撒旦12ccs- sd";$title = utf8Substr($title, 0, 15);echo $title;?>