PHP切割汉字的常用方法实例总结


						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：





<?php

/*

@UTF-8编码的字符可能由1~3个字节组成。

*/

/*--------------------------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) == "&amp;") {

        $cstep = 5;

        $length += 5;

        $i += 4;

        $realnum++;

        if ($magic) {

          $alen++;

        }

      } elseif (substr($title, $i, 6) == "&quot;") {

        $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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