21段救命PHP代码(7)

$json_string='{"id":1,"name":"foo","email":"php">foo@foobar.com","interest":["wordpress","php"]} ';
$obj=json_decode($json_string);
echo $obj->name; //prints foo
echo $obj->interest[1]; //prints php
　8. PHP解析 XML 数据
        //xml string
        $xml_string="<?xml version='1.0'?>
        <users>
        <user id='398'>
        <name>Foo</name>
        <email>foo@bar.com</name>
        </user>
        <user id='867'>
        <name>Foobar</name>
        <email>foobar@foo.com</name>
        </user>
        </users>";   
        
        //load the xml string using simplexml
        $xml = simplexml_load_string($xml_string);   
        
        //loop through the each node of user
        foreach ($xml->user as $user)
        {
        //access attribute
        echo $user['id'], ' ';
        //subnodes are accessed by -> operator
        echo $user->name, ' ';
        echo $user->email, '<br />';
        }

　9. PHP创建日志缩略名
　　创建用户友好的日志缩略名。
        function create_slug($string){
        $slug=preg_replace('/[^A-Za-z0-9-]+/', '-', $string);
        return $slug;
        }
10. PHP获取客户端真实 IP 地址
　　该函数将获取用户的真实 IP 地址，即便他使用代理服务器。
        function getRealIpAddr()
        {
                if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))