php中文字符串截取多种方法汇总

1. 截取GB2312中文字符串

rush:PHP;"> PHP

< ?PHP
//截取中文字符串
function mysubstr($str,$start,$len) {
$tmpstr = "";
$strlen = $start + $len;
for($i = 0; $i < $strlen; $i++) {
if(ord(substr($str,$i,1)) > 0xa0) {
$tmpstr .= substr($str,2);
$i++;
} else
$tmpstr .= substr($str,1);
}
return $tmpstr;
}
?>

2. 截取utf8编码的多字节字符串

rush:PHP;"> PHP < ?php //截取utf8字符串 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); } ?>

3. UTF-8、GB2312都支持的汉字截取函数

rush:PHP;"> PHP < ?php /* Utf-8、gb2312都支持的汉字截取函数 cut_str(字符串,截取长度,开始长度,编码); 编码默认为 utf-8 开始长度默认为 0 */

function cut_str($string,$sublen,$start = 0,$code = 'UTF-8')
{
if($code == 'UTF-8')
{
$pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
preg_match_all($pa,$string,$t_string);

if(count($t_string[0]) - $start > $sublen) return join('',array_slice($t_string[0],$sublen))."...";
return join('',$sublen));

}
else
{
$start = $start2;
$sublen = $sublen2;
$strlen = strlen($string);
$tmpstr = '';

for($i=0; $i< $strlen; $i++)
{
  if($i>=<a href="https://www.jb51.cc/tag/start/" target="_blank" class="keywords">$start</a> && $i< ($start+$sublen))
  {
    if(ord(substr($string,1))>129)
    {
      $tmpstr.= substr($string,2);
    }
    else
    {
      $tmpstr.= substr($string,1);
    }
  }
  if(ord(substr($string,1))>129) $i++;
}
if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
return $tmpstr;

}
}

$str = "abcd需要截取的字符串";
echo cut_str($str,8,'gb2312');
?>

4. BugFree 的字符截取函数

<div class="jb51code">
<pre class="brush:PHP;">
< ?PHP
/**

• @package BugFree
• @version $Id: FunctionsMain.inc.PHP,v 1.32 2005/09/24 11:38:37 wwccss Exp $
• Return part of a string(Enhance the function substr())
• @author Chunsheng Wang [e-mail]
• @param string $String the string to cut.
• @param int $Length the length of returned string.
• @param booble $Append whether append "...": false|true
• @return string the cutted string.
  */
  function sysSubStr($String,$Length,$Append = false)
  {
  if (strlen($String) < = $Length )
  {
  return $String;
  }
  else
  {
  $I = 0;
  while ($I < $Length)
  {
  $StringTMP = substr($String,$I,1);
  if ( ord($StringTMP) >=224 )
  {
  $StringTMP = substr($String,3);
  $I = $I + 3;
  }
  elseif( ord($StringTMP) >=192 )
  {
  $StringTMP = substr($String,2);
  $I = $I + 2;
  }
  else
  {
  $I = $I + 1;
  }
  $StringLast[] = $StringTMP;
  }
  $StringLast = implode("",$StringLast);
  if($Append)
  {
  $StringLast .= "...";
  }
  return $StringLast;
  }
  }

$String = "17test.info 走在中国自动化测试的前沿";
$Length = "18";
$Append = false;
echo sysSubStr($String,$Append);
?>