PHP编码转换函数mb_convert_encoding与iconv用法

cd /tmp/php-5.3.28/ext/mbstring/
usr/local/services/php/bin/phpize
./configure --with-php-config=/usr/local/services/php/bin/php-config
make && make install
vim /usr/local/services/php/etc/php.ini
extension="/usr/local/services/php/lib/php/extensions/no-debug-non-zts-20090626/mbstring.so";
 iconv
string iconv ( string in_charset, string out_charset, string str )

<?php
header(“content-Type: text/html; charset=big5″);
echo mb_convert_encoding(“你是我的朋友”, “big5″, “GB2312″);
?>

$text=iconv("GB2312","UTF-8",$text);

$text=iconv("UTF-8","GBK",$text);

iconv("UTF-8","GB2312//IGNORE",$data);

$content = iconv("GBK", "UTF-8″, $content);
$content = mb_convert_encoding($content, "UTF-8″, "GBK");

$string = "8aeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeer8aaaaaaaaaaaaaaaaaaaaaaadasd456as
 d456asd456asd456asd456asd456asd456asd456asd456asd456asd456asd456fasdf45645645645645645
 6456456456456456456456456456456456456456456456456456456456456456456456456a56fs4s4s4s4s
 4s4s4s4s4s4s4s4s4s4dsdga133333333333333333333w8etw7q9999999999999999999a23s1dfffffffff
 fffffffffffffffa456ssssssssssssdv2sdddddddddddddddddddf";
 echo "字符串长度：";
 echo strlen($xx);
 echo "<br/>gzcompress压缩后长度 ：";
 echo strlen(gzcompress($string,9));
 echo "<br/>gzencode压缩后长度：";
 echo strlen(gzencode($string,9));
 echo "<br/>gzdeflate压缩后长度：";
 echo strlen(gzdeflate($string,9));

<?php
/**
 * php模拟curl请求
 *
 * @param string $url     请求的url
 * @param string $method  请求的方法, 默认POST
 * @param array  $data    请求传递的数据
 * @param array  $header  请求设置的头信息
 * @param int    $head    是否打印头信息
 * @param int    $body    是否打印body信息
 * @param int    $timeout 设置超时时间
 *
 * @return array
 */
function curl($url,$method="POST",$data=array(),$header=array(),$head=0,$body=0,$timeout = 30)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    if (strpos($url, "https") !== false ) {
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        if (isset($_SERVER['HTTP_USER_AGENT'])) {
            curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
        }
    }
    if (!empty($header)) {
        curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    }
    switch ($method) {
    case 'POST':
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        break;
    case 'GET':
        break;
    case 'PUT':
        curl_setopt($ch, CURLOPT_PUT, 1);
        curl_setopt($ch, CURLOPT_INFILE, '');
        curl_setopt($ch, CURLOPT_INFILESIZE, 10);
        break;
    case 'DELETE':
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE");
        break;
    default:
        break;
    }

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HEADER, $head);
    curl_setopt($ch, CURLOPT_NOBODY, $body);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    $rtn = curl_exec($ch); //获得返回
    if (curl_errno($ch)) {
        echo 'Errno'.curl_error($ch);//捕抓异常
    }
    curl_close($ch);
    return $rtn;
}
?>

$a=array("周","满","和","个人","博客","www.111cn.net","周满和","个人博客");
$b=serialize($a);
print_r($b);
echo "<br/>";
$c=unserialize($b);
print_r($c);

输出结果是:

//经过serialize序列化之后得到的数据，也是存这个进数据库
a:8:{i:0;s:3:"周";i:1;s:3:"满";i:2;s:3:"和";i:3;s:6:"个人";i:4;s:6:"博客";i:5;s:20:"www.111cn.net";i:6;s:9:"周满和";i:7;s:12:"个人博客";}
 
//经过unserialize()反序列化得到的数据，和之前的$a数组结构一样吧
Array ( [0] => 周 [1] => 满 [2] => 和 [3] => 个人 [4] => 博客 [5] => www.111cn.net [6] => 周满和 [7] => 个人博客 )

$a1=array(
    'name'=>array("周","满",'和'),
    'name_weburl'=>array("周满和","www.111cn.net"),
    'all'=>array('周满和个人博客'=>'www.111cn.net')
);
$b1=serialize($a1);
print_r($b1);
echo "<br/>";
$c1=unserialize($b1); 
print_r($c1);

输出结果是:

//经过serialize序列化之后得到的数据，也是存这个进数据库
a:3:{s:4:"name";a:3:{i:0;s:3:"周";i:1;s:3:"满";i:2;s:3:"和";}s:11:"name_weburl";a:2:{i:0;s:9:"周满和";i:1;s:20:"www.111cn.net";}s:3:"all";a:1:{s:21:"周满和个人博客";s:20:"www.111cn.net";}}
 
//经过unserialize()反序列化得到的数据，和之前的$a数组结构一样吧
Array ( [name] => Array ( [0] => 周 [1] => 满 [2] => 和 ) [name_weburl] => Array ( [0] => 周满和 [1] => www.111cn.net ) [all] => Array ( [周满和个人博客] => www.111cn.net ) )

<?php
    //在一个大的背景图片中裁剪出指定区域的图片，以jpeg图片格式为例
    function cut($filename,$x,$y,$width,$height){
        $back = imagecreatetruecolor($width, $height);
        //创建一个可以保存裁剪后图片的资源
        $cutimg = imagecreatetruecolor($width, $height);
        //使用imagecopyresampled()函数对图片进行裁剪
        imagecopyresampled($cutimg,$back,0,0,$x,$y,$width,$height,$width,$height);
        //保存裁剪 后的图片，如果不想覆盖图片可以为裁剪后的图片加上前缀
        imagejpeg($cutimg,$filename);
        imagedestroy($cutimg);
        imagedestroy($back);
    }
 
    cut("brophp.jpg", 50, 50, 200, 200);
?>