一、查看邮件是否已被阅读
当你在发送邮件时，你或许很想知道该邮件是否被对方已阅读。这里有段非常有趣的代码片段能够显示对方ip地址记录阅读的实际日期和时间。
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);
?>二、从网页中提取关键字
一段伟大的代码片段能够轻松的从网页中提取关键字。$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 );三、查找页面上的所有链接
使用dom，你可以轻松从任何页面上抓取链接，代码示例如下： $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 length; $i++) {
$href = $hrefs->item($i);
$url = $href->getattribute('href');
echo $url.'
';
}四、自动转换url，跳转至超链接
在wordpress中，如果你想自动转换url，跳转至超链接页面，你可以利用内置的函数make_clickable()执行此操作。如果你想基于wordpress之外操作该程序，那么你可以参考wp-includes/formatting.php源代码。 function _make_url_clickable_cb($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 $ret;
}五、创建数据url
数据url可以直接嵌入到html/css/js中，以节省大量的 http请求。 下面的这段代码可利用$file轻松创建数据url。 function data_uri($file, $mime) {
$contents=file_get_contents($file);
$base64=base64_encode($contents);
echo data:$mime;base64,$base64;
}六、从服务器上下载&保存一个远程图片 $image = file_get_contents('http://www.url.com/image.jpg');
file_put_contents('/images/image.jpg', $image); 七、移除remove microsoft word html tag
当你使用microsoft word会创建许多tag，比如font，span，style，class等。这些标签对于word本身而言是非常有用的，但是当你从word粘贴至网页时，你会发现很多无用的tag。因此，下面的这段代码可帮助你删除所有无用的word html tag。function cleanhtml($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 $html
}八、检测浏览器语言
如果你的网站上有多种语言，那么可以使用这段代码作为默认的语言来检测浏览器语言。该段代码将返回浏览器客户端使用的初始语言。function get_client_language($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;
}
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