欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  php教程

收集了php中截取字符串函数

程序员文章站 2022-04-22 23:19:26
...
本文章是收集了几个常用的字符串截取函数,这是解决了php中对各种编码的字符截取会乱码的问题,有需要的同学可以参考一一下。

截取GB2312中文字符串

代码如下 复制代码

//截取中文字符串

function mysubstr($str, $start, $len) {

$tmpstr = "";

$strlen = $start + $len;

for($i = 0; $i

if(ord(substr($str, $i, 1)) > 0xa0) {

$tmpstr .= substr($str, $i, 2);

$i++;

} else

$tmpstr .= substr($str, $i, 1);

}

return $tmpstr;

}

?>

2. 截取utf8编码的多字节字符串

代码如下 复制代码

//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

/*

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

*/

代码如下 复制代码

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], $start, $sublen))."...";

return join('', array_slice($t_string[0], $start, $sublen));

}

else

{

$start = $start*2;

$sublen = $sublen*2;

$strlen = strlen($string);

$tmpstr = '';

for($i=0; $i

{

if($i>=$start && $i

{

if(ord(substr($string, $i, 1))>129)

{

$tmpstr.= substr($string, $i, 2);

}

else

{

$tmpstr.= substr($string, $i, 1);

}

}

if(ord(substr($string, $i, 1))>129) $i++;

}

if(strlen($tmpstr)

return $tmpstr;

}

}

$str = "abcd需要截取的字符串";

echo cut_str($str, 8, 0, 'gb2312');

?>

4. BugFree 的字符截取函数

代码如下 复制代码

/**

* @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

* @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)

{

return $String;

}

else

{

$I = 0;

while ($I

{

$StringTMP = substr($String,$I,1);

if ( ord($StringTMP) >=224 )

{

$StringTMP = substr($String,$I,3);

$I = $I + 3;

}

elseif( ord($StringTMP) >=192 )

{

$StringTMP = substr($String,$I,2);

$I = $I + 2;

}

else

{

$I = $I + 1;

}

$StringLast[] = $StringTMP;

}

$StringLast = implode("",$StringLast);

if($Append)

{

$StringLast .= "...";

}

return $StringLast;

}

}

$String = "php100.com-- 简单、精彩、通用";

$Length = "18";

$Append = false;

echo sysSubStr($String,$Length,$Append);

?>