php mb_substr实现中文字符串截取无乱码的方法

<?php
$str = '这样一来我的字符串就不会有乱码^_^';

echo "mb_substr:" . mb_substr($str, 0, 7, 'utf-8');
//结果：这样一来我的字
echo "<br>";

echo "mb_strcut:" . mb_strcut($str, 0, 6, 'utf-8');
//结果：这样
?>

/**
 *   实现中文字串截取无乱码的方法
 */
function getSubstr($string, $start, $length) {
        if(mb_strlen($string,'utf-8')>$length){
            $str = mb_substr($string, $start, $length,'utf-8');
            return $str.'...';
        }else{
                return $string;
        }
}

function getrealurl($url){
 $header = get_headers($url,1);
 if (strpos($header[0],'301') || strpos($header[0],'302')) {
  if(is_array($header['Location'])) {
   return $header['Location'][count($header

['Location'])-1];
  }else{
   return $header['Location'];
  }
 }else {
  return $url;
 }
}

$url = 'http://111cn.net';

print_r(get_headers($url));

Array
(
    [0] => HTTP/1.1 301 Moved Permanently
    [1] => Date: Tue, 01 Jul 2014 07:49:26 GMT
    [2] => Server: Apache/2.2.22 (Win32) PHP/5.2.17
    [3] => Location: http://www.111cn.net/
    [4] => Content-Length: 314
    [5] => Content-Type: text/html; charset=iso-8859-1
    [6] => X-Via: 1.1 jszjsx60:8080 (Cdn Cache Server V2.0), 1.1 zb51:6 (Cdn Cache Server V2.0)
    [7] => Connection: close
    [8] => HTTP/1.1 200 OK
    [9] => Date: Tue, 01 Jul 2014 07:49:27 GMT
    [10] => Server: Apache/2.2.22 (Win32) PHP/5.2.17
    [11] => Last-Modified: Tue, 01 Jul 2014 07:41:43 GMT
    [12] => ETag: "7a0000002fe1a1-68a9-4fd1ce83bc0f7"
    [13] => Accept-Ranges: bytes
    [14] => Content-Length: 26793
    [15] => Content-Type: text/html
    [16] => X-Via: 1.1 jszjsx60:8080 (Cdn Cache Server V2.0), 1.1 zb62:5 (Cdn Cache Server V2.0)
    [17] => Connection: close
)

date(“l”); //data就可以获取英文的星期比如Sunday
date(“w”); //这个可以获取数字星期比如123，注意0是星期日

$weekarray=array(“日”,”一”,”二”,”三”,”四”,”五”,”六”); //先定义一个数组

echo “星期”.$weekarray[date("w")];

$weekarray=array(“日”,”一”,”二”,”三”,”四”,”五”,”六”);
echo “星期”.$weekarray[date("w","2011-11-11")];

<?php echo $showtime=date("Y-m-d H:i:s");?>

date_default_timezone_set(UTC);

register_globals = Off

post_max_size = 8M

/* 字符串过滤函数 */ 

function stringFilter($str) 
{ 
if (ini_get(’magic_quotes_gpc)’)
{ 
return $str; 
}
else { 
return addslashes($str); 
} 
}

<?php
echo ini_get('display_errors'); //1
//动态修改php.ini配置信息，脚本执行后失效
ini_set('display_errors',0);
echo ini_get('display_errors');//0

<?php
//打印所有配置信息，巨多。。。
print_r(ini_get_all());

<?php

echo ini_get('display_errors'); //1
//动态修改php.ini配置信息，脚本执行后失效
ini_set('display_errors',0);
ini_restore('display_errors');
echo ini_get('display_errors');//1