9个实用的PHP代码片段分享
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。
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。
$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。
$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 < $hrefs->length; $i++) {
$href = $hrefs->item($i);
$url = $href->getAttribute('href');
echo $url.'';
}
源代码:http://snipplr.com/view/70489/find-all-links-on-a-page/
四.自动转换URL为可点击超链接
在Wordpress中,如果你想自动转换所有的URLs为可点击超链接,你就可以使用内置函数make_clickable()实现。当你在WordPress外操作时,你可以参考wp-includes/formatting.php中的源代码。
function _make_url_clickable_cb($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。
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。
$image = file_get_contents('http://www.php100.com/image.jpg');
file_put_contents('/images/image.jpg', $image); //Where to save the image
源代码:http://www.catswhocode.com/blog/snippets/download-save-a-remote-image-on-your-server-using-php
七.移除Microsoft Word HTML标签
当你使用Microsoft Word时,会创建很多标签tag,比如font、span、style、class等,这些标签在Word中十分有用,但当你从Word中把文本粘贴到网页上,就会出现很多没用的标签。下面实用的函数可以帮助你清除所有的Word HTML标签。
function cleanHTML($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
$html = ereg_replace("<(/)?(font|span|del|ins)[^>]*>","",$html);
// then run another pass over the html (twice), removing unwanted attributes
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<\1>",$html);
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<\1>",$html);
return $html
}
源代码:http://tim.mackey.ie/CommentView,guid,2ece42de-a334-4fd0-8f94-53c6602d5718.aspx
八.检测浏览器语言
如果你的网站是多种语言的,下面的代码可以帮助你检测浏览器语言,它会返回客户端浏览器的默认语言。
function get_client_language($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。
$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