9个经典的PHP代码片段分享

<?
error_reporting(0);
Header("Content-Type: image/jpeg");
//Get IP
if (!empty($_SERVER['HTTP_CLIENT_IP']))
{
? $ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
{
? $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
? $ip=$_SERVER['REMOTE_ADDR'];
}
//Time
$actual_time = time();
$actual_day = date('Y.m.d',$actual_time);
$actual_day_chart = date('d/m/y',$actual_time);
$actual_hour = date('H:i:s',$actual_time);
//GET Browser
$browser = $_SERVER['HTTP_USER_AGENT'];
//LOG
$myFile = "log.txt";
$fh = fopen($myFile,'a+');
$stringData = $actual_day . ' ' . $actual_hour . ' ' . $ip . ' ' . $browser . ' ' . "rn";
fwrite($fh,$stringData);
fclose($fh);
//Generate Image (Es. dimesion is 1x1)
$newimage = ImageCreate(1,1);
$grigio = ImageColorAllocate($newimage,255,255);
ImageJPEG($newimage);
ImageDestroy($newimage);
?>

$meta = get_meta_tags('http://www.emoticode.net/');
$keywords = $meta['keywords'];
// Split keywords
$keywords = explode(',',$keywords );
// Trim them
$keywords = array_map( 'trim',$keywords );
// Remove empty values
$keywords = array_filter( $keywords );
print_r( $keywords );

$html = file_get_contents('http://www.example.com');
$dom = new DOMDocument();
@$dom->loadHTML($html);
// grab all the on the page
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");
for ($i = 0; $i < $hrefs->length; $i++) {
?????? $href = $hrefs->item($i);
?????? $url = $href->getAttribute('href');
?????? echo $url.'<br />';
}

function _make_url_clickable_cb($matches) {
??? $ret = '';
??? $url = $matches[2];
??? if ( empty($url) )
??????? return $matches[0];
??? // removed trailing [.,;:] from URL
??? if ( in_array(substr($url,-1),array('.',';',':')) === true ) {
??????? $ret = substr($url,-1);
??????? $url = substr($url,strlen($url)-1);
??? }
??? return $matches[1] . "<a href="$url" rel="nofollow">$url</a>" . $ret;
}
function _make_web_ftp_clickable_cb($matches) {
??? $ret = '';
??? $dest = $matches[2];
??? $dest = 'http://' . $dest;
??? if ( empty($dest) )
??????? return $matches[0];
??? // removed trailing [,;:] from URL
??? if ( in_array(substr($dest,':')) === true ) {
??????? $ret = substr($dest,-1);
??????? $dest = substr($dest,strlen($dest)-1);
??? }
??? return $matches[1] . "<a href="$dest" rel="nofollow">$dest</a>" . $ret;
}
function _make_email_clickable_cb($matches) {
??? $email = $matches[2] . '@' . $matches[3];
??? return $matches[1] . "<a href="mailto:$email">$email</a>";
}
function make_clickable($ret) {
??? $ret = ' ' . $ret;
??? // in testing,using arrays here was found to be faster
??? $ret = preg_replace_callback('#([s>])([w]+?://[wx80-xff#$%&~/.-;:=,?@[]+]*)#is','_make_url_clickable_cb',$ret);
??? $ret = preg_replace_callback('#([s>])((www|ftp).[wx80-xff#$%&~/.-;:=,'_make_web_ftp_clickable_cb',$ret);
??? $ret = preg_replace_callback('#([s>])([.0-9a-z_+-]+)@(([0-9a-z-]+.)+[0-9a-z]{2,})#i','_make_email_clickable_cb',$ret);
??? // this one is not in an array because we need it to run last,for cleanup of accidental links within links
??? $ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i","$1$3</a>",$ret);
??? $ret = trim($ret);
??? return $ret;
}

function data_uri($file,$mime) {
? $contents=file_get_contents($file);
? $base64=base64_encode($contents);
? echo $base64";
}

$image = file_get_contents('http://www.url.com/image.jpg');
file_put_contents('/images/image.jpg',$image); //Where to save the image

function cleanHTML($html) {
/// <summary>
/// Removes all FONT and SPAN tags,and all Class and Style attributes.
/// Designed to get rid of non-standard Microsoft Word HTML tags.
/// </summary>
// start by completely removing all unwanted tags
$html = ereg_replace("<(/)?(font|span|del|ins)[^>]*>","",$html);
// then run another pass over the html (twice),removing unwanted attributes
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<1>",$html);
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>",$html);
return $html
}
[code]

PHP实例八、检测浏览器语言
　　如果你的网站上有多种语言,那么可以使用这段代码作为默认的语言来检测浏览器语言.该段代码将返回浏览器客户端使用的初始语言.

PHP实例[code]
function get_client_language($availableLanguages,$default='en'){
??? if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
??????? $langs=explode(',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
?
??????? foreach ($langs as $value){
??????????? $choice=substr($value,2);
??????????? if(in_array($choice,$availableLanguages)){
??????????????? return $choice;
??????????? }
??????? }
??? }
??? return $default;
}

<?php
??? $page_id = "YOUR PAGE-ID";
??? $xml = @simplexml_load_file("http://api.facebook.com/restserver.php?method=facebook.fql.query&query=SELECT%20fan_count%20FROM%20page%20WHERE%20page_id=".$page_id."") or die ("a lot");
??? $fans = $xml->page->fan_count;
??? echo $fans;
?>