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HomeBackend DevelopmentPHP Tutorial9个实用的PHP代码片段分享_PHP

一.查看邮件是否已被阅读
      
当你发送邮件时,你肯定很想知道你的邮件是否已被对方查看。下面的代码就能实现记录阅读你邮件的IP地址,还有实际的阅读日期和时间。

代码如下:


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 . ' ' . $browser . ' ' . "\r\n";
fwrite($fh, $stringData);
fclose($fh);
//Generate Image (Es. dimesion is 1x1)
$newimage = ImageCreate(1,1);
$grigio = ImageColorAllocate($newimage,255,255,255);
ImageJPEG($newimage);
ImageDestroy($newimage);
?>


源代码:http://www.emoticode.net/php/code-to-find-out-if-your-email-has-been-read.html
 
二.从网页中提取关键词

这段优秀的代码可以简单地实现从网页中提取关键词的功能。

代码如下:


$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 );


源代码:http://www.emoticode.net/php/extract-keywords-from-any-webpage.html
 
三.查找页面上的所有链接

使用DOM,你可以在任意页面上抓取链接,示例如下。

代码如下:


$html = file_get_contents('http://www.php100.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 length; $i++) {
       $href = $hrefs->item($i);
       $url = $href->getAttribute('href');
       echo $url.'';
}


源代码:http://snipplr.com/view/70489/find-all-links-on-a-page/
 
四.自动转换URL为可点击超链接
      
在Wordpress中,如果你想自动转换所有的URLs为可点击超链接,你就可以使用内置函数make_clickable()实现。当你在WordPress外操作时,你可以参考wp-includes/formatting.php中的源代码。

代码如下:


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, 0, strlen($url)-1);
    }
    return $matches[1] . "$url" . $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, -1), array('.', ',', ';', ':')) === true ) {
        $ret = substr($dest, -1);
        $dest = substr($dest, 0, strlen($dest)-1);
    }
    return $matches[1] . "$dest" . $ret;
}
 
function _make_email_clickable_cb($matches) {
    $email = $matches[2] . '@' . $matches[3];
    return $matches[1] . "$email";
}
 
function make_clickable($ret) {
    $ret = ' ' . $ret;
    // in testing, using arrays here was found to be faster
    $ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)     #is', '_make_url_clickable_cb', $ret);
    $ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_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("#(]+?>|>))]+?>([^>]+?)#i", "$1$3", $ret);
    $ret = trim($ret);
    return $ret;
}


源代码:http://zenverse.net/php-function-to-auto-convert-url-into-hyperlink/
 
 五.创建数据URI

数据URI可以帮助将图像嵌入到HTML/CSS/JS中,从而节省HTTP请求。下面的函数可以利用$file创建数据URI。

代码如下:


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


源代码:http://css-tricks.com/snippets/php/create-data-uris/
 
六.下载和保存远程图片到你的服务器
      
当你在搭建网站时,很可能会从远程服务器上下载图片保存到你自己的服务器上,下面的代码就可以帮助你实现这个功能。

代码如下:


$image = file_get_contents('http://www.php100.com/image.jpg');
file_put_contents('/images/image.jpg', $image);   //Where to save the image


源代码:http://www.catswhocode.com/blog/snippets/download-save-a-remote-image-on-your-server-using-php
 
七.移除Microsoft Word HTML标签
      
当你使用Microsoft Word时,会创建很多标签tag,比如font、span、style、class等,这些标签在Word中十分有用,但当你从Word中把文本粘贴到网页上,就会出现很多没用的标签。下面实用的函数可以帮助你清除所有的Word HTML标签。

代码如下:


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


源代码:http://tim.mackey.ie/CommentView,guid,2ece42de-a334-4fd0-8f94-53c6602d5718.aspx
 
八.检测浏览器语言

如果你的网站是多种语言的,下面的代码可以帮助你检测浏览器语言,它会返回客户端浏览器的默认语言。

代码如下:


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,0,2);
              if(in_array($choice, $availableLanguages)){
                    return $choice;
              }
          }
      }
      return $default;
}


源代码:http://snipplr.com/view/12631/detect-browser-language/
 
九.显示Facebook上的粉丝数量
      
如果在你的网站或博客中,链有Facebook页面,你可能希望显示Facebook上的粉丝数量,下面的代码就可以帮助你获取粉丝数量,另外不要忘记在代码第二行添加你的页面ID。

代码如下:

   
$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;
?>


源代码:http://www.wprecipes.com/display-number-of-facebook-fans-in-full-text-on-your-wordpress-blog
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