收集了php中截取字符串函数

< ?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, $i, 2);

$i++;

} else

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

}

return $tmpstr;

}

?>

< ?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);

}

?>

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< $strlen; $i++)

{

if($i>=$start && $i< ($start+$sublen))

{

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)< $strlen ) $tmpstr.= "...";

return $tmpstr;

}

}

$str = "abcd需要截取的字符串";

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

?>

/**

* @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,$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 = "111cn.net-- 简单、精彩、通用";

$Length = "18";

$Append = false;

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

?>

< ?php

include_once('pclzip.lib.php');

$archive = new PclZip('archive.zip');

$v_list = $archive->create('file.txt,data/text.txt,folder');

if ($v_list == 0) {

die("Error : ".$archive->errorInfo(true));

}

?>

< ?php

include_once('pclzip.lib.php');

$archive = new PclZip('archive.zip');

$v_list = $archive->create('data/file.txt,data/text.txt',

PCLZIP_OPT_REMOVE_PATH, 'data',

PCLZIP_OPT_ADD_PATH, 'install');

if ($v_list == 0) {

die("Error : ".$archive->errorInfo(true));

}

?>

//-----------------------------------------------------------------------------------

// 函数名：CheckExtendName($C_filename,$A_extend)

// 作 用：上传文件的扩展名判断

// 参 数：$C_filename 上传的文件名

// $A_extend 要求的扩展名

// 返回值：布尔值

// 备 注：无

//-----------------------------------------------------------------------------------

function CheckExtendName($C_filename,$A_extend)

{

if(strlen(trim($C_filename)) < 5)

{

return 0; //返回0表示没上传图片

}

$lastdot = strrpos($C_filename, "."); //取出.最后出现的位置

$extended = substr($C_filename, $lastdot+1); //取出扩展名

for($i=0;$i{

if (trim(strtolower($extended)) == trim(strtolower($A_extend[$i]))) //转换大

小写并检测

{

$flag=1; //加成功标志

$i=count($A_extend); //检测到了便停止检测

}

}

if($flag<>1)

{

for($j=0;$j{

$alarm .= $A_extend[$j]." ";

}

AlertExit('只能上传'.$alarm.'文件！而你上传的是'.$extended.'类型的文件');

return -1; //返回-1表示上传图片的类型不符

}

return 1; //返回1表示图片的类型符合要求

}

//-----------------------------------------------------------------------------------

// 函数名：CheckImageSize($ImageFileName,$LimitSize)

// 作 用：检验上传图片的大小

// 参 数：$ImageFileName 上传的图片名

// $LimitSize 要求的尺寸

// 返回值：布尔值

// 备 注：无

//-----------------------------------------------------------------------------------

function CheckImageSize($ImageFileName,$LimitSize)

{

$size=GetImageSize($ImageFileName);

if ($size[0]>$LimitSize[0] ││ $size[1]>$LimitSize[1])

{

AlertExit('图片尺寸过大');

return false;

}

return true;

}

//-----------------------------------------------------------------------------------

// 函数名：Alert($C_alert,$I_goback=0)

// 作 用：非法操作警告

// 参 数：$C_alert（提示的错误信息）

// $I_goback（返回到那一页）

// 返回值：字符串

// 备 注：无

//-----------------------------------------------------------------------------------

function Alert($C_alert,$I_goback=0)

{

if($I_goback<>0)

{

echo " ";

}

else

{

echo " ";

}

}

?>

bool setcookie ( string $name [, string $value [, int $expire = 0 [, string $path [, string $domain [, bool $secure = false [, bool $httponly = false ]]]]]] )

require_once "Benchmark/Iterate.php";
$bench = new Benchmark_Iterate;
function check1($var){
    isset($var);
}
function check2($var){
    !empty($var);
}
$bench->run(50,"check1",$var);
//$bench->run(50,"check2",$var);
$result = $bench->get();