超级有用的PHP代码片段。当你在开发网站、应用或者博客时，利用这些代码能为你节省大量的时间。
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。 <br>
error_reporting(0); <br>
Header("Content-Type: image/jpeg"); <br>
<br>
//Get IP if (!empty($_SERVER['HTTP_CLIENT_IP'])) <br>
{ <br>
$ip=$_SERVER['HTTP_CLIENT_IP']; <br>
} <br>
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) <br>
{ <br>
$ip=$_SERVER['HTTP_X_FORWARDED_FOR']; <br>
} <br>
else<br>
{ <br>
$ip=$_SERVER['REMOTE_ADDR']; <br>
} <br>
<br>
//Time $actual_time = time(); <br>
$actual_day = date('Y.m.d', $actual_time); <br>
$actual_day_chart = date('d/m/y', $actual_time); <br>
$actual_hour = date('H:i:s', $actual_time); <br>
<br>
//GET Browser $browser = $_SERVER['HTTP_USER_AGENT']; <br>
<br>
//LOG $myFile = "log.txt"; <br>
$fh = fopen($myFile, 'a+'); <br>
$stringData = $actual_day . ' ' . $actual_hour . ' ' . $ip . ' ' . $browser . ' ' . "\r\n"; <br>
fwrite($fh, $stringData); <br>
fclose($fh); <br>
<br>
//Generate Image (Es. dimesion is 1x1) $newimage = ImageCreate(1,1); <br>
$grigio = ImageColorAllocate($newimage,255,255,255); <br>
ImageJPEG($newimage); <br>
ImageDestroy($newimage); <br>
<br>
?>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/'); <br>
$keywords = $meta['keywords']; <br>
// Split keywords $keywords = explode(',', $keywords ); <br>
// Trim them $keywords = array_map( 'trim', $keywords ); <br>
// Remove empty values $keywords = array_filter( $keywords ); <br>
<br>
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'); <br>
<br>
$dom = new DOMDocument(); <br>
@$dom->loadHTML($html); <br>
<br>
// grab all the on the page $xpath = new DOMXPath($dom); <br>
$hrefs = $xpath->evaluate("/html/body//a"); <br>
<br>
for ($i = 0; $i length; $i++) { <br>
$href = $hrefs->item($i); <br>
$url = $href->getAttribute('href'); <br>
echo $url.'<br>'; <br>
}四、自动转换URL，跳转至超链接
在WordPress中，如果你想自动转换URL，跳转至超链接页面，你可以利用内置的函数make_clickable()执行此操作。如果你想基于WordPress之外操作该程序，那么你可以参考wp-includes/formatting.php源代码。 function _make_url_clickable_cb($matches) { <br>
$ret = ''; <br>
$url = $matches[2]; <br>
<br>
if ( empty($url) ) <br>
return $matches[0]; <br>
// removed trailing [.,;:] from URL if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) { <br>
$ret = substr($url, -1); <br>
$url = substr($url, 0, strlen($url)-1); <br>
} <br>
return $matches[1] . "<a>$url</a>" . $ret; <br>
} <br>
<br>
function _make_web_ftp_clickable_cb($matches) { <br>
$ret = ''; <br>
$dest = $matches[2]; <br>
$dest = 'http://' . $dest; <br>
<br>
if ( empty($dest) ) <br>
return $matches[0]; <br>
// removed trailing [,;:] from URL if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) { <br>
$ret = substr($dest, -1); <br>
$dest = substr($dest, 0, strlen($dest)-1); <br>
} <br>
return $matches[1] . "<a>$dest</a>" . $ret; <br>
} <br>
<br>
function _make_email_clickable_cb($matches) { <br>
$email = $matches[2] . '@' . $matches[3]; <br>
return $matches[1] . "<a>$email</a>"; <br>
} <br>
<br>
function make_clickable($ret) { <br>
$ret = ' ' . $ret; <br>
// 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); <br>
$ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_web_ftp_clickable_cb', $ret); <br>
$ret = preg_replace_callback('#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret); <br>
<br>
// 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", $ret); <br>
$ret = trim($ret); <br>
return $ret; <br>
}五、创建数据URL
数据URL可以直接嵌入到HTML/CSS/JS中，以节省大量的 HTTP请求。 下面的这段代码可利用$file轻松创建数据URL。 function data_uri($file, $mime) { <br>
$contents=file_get_contents($file); <br>
$base64=base64_encode($contents); <br>
echo "data:$mime;base64,$base64"; <br>
}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'); <br>
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) { <br>
/// <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 <br>
$html = ereg_replace("]*>","",$html); <br>
<br>
// then run another pass over the html (twice), removing unwanted attributes <br>
$html = ereg_replace("]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","",$html); <br>
$html = ereg_replace("]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","",$html); <br>
<br>
return $html <br>
}八、检测浏览器语言
如果你的网站上有多种语言，那么可以使用这段代码作为默认的语言来检测浏览器语言。该段代码将返回浏览器客户端使用的初始语言。function get_client_language($availableLanguages, $default='en'){ <br>
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) { <br>
$langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']); <br>
<br>
foreach ($langs as $value){ <br>
$choice=substr($value,0,2); <br>
if(in_array($choice, $availableLanguages)){ <br>
return $choice; <br>
} <br>
} <br>
} <br>
return $default; <br>
}
AD：真正免费，域名+虚机+企业邮箱=0元
