php中文字符串截取多种方法汇总

发布时间：2020-12-12 21:45:37 所属栏目：PHP教程来源：网络整理

导读：1. 截取GB2312中文字符串 ?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 .=

1. 截取GB2312中文字符串

< ?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

3. UTF-8、GB2312都支持的汉字截取函数

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>=$start && $i< ($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 wwccss@263.net
@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);
?>

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