再来二十一段救命的PHP代码(4)

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']))

    {

        $ip=$_SERVER['HTTP_CLIENT_IP'];

    }

    elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))

    //to check ip is pass from proxy

    {

        $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];

    }

    else

    {

        $ip=$_SERVER['REMOTE_ADDR'];

    }

    return $ip;

} 11. PHP强制性文件下载

为用户提供强制性的文件下载功能。

 /********************

*@file - path to file

*/

function force_download($file)

{

if ((isset($file))&&(file_exists($file))) {

header("Content-length: ".filesize($file));

header('Content-Type: application/octet-stream');

header('Content-Disposition: attachment; filename="' . $file . '"');

readfile("$file");

} else {

echo "No file selected";

}

} 12. PHP创建标签云

 function getCloud( $data = array(), $minFontSize = 12, $maxFontSize = 30 )

{

$minimumCount = min( array_values( $data ) );

$maximumCount = max( array_values( $data ) );

$spread = $maximumCount - $minimumCount;

$cloudHTML = '';