Maison > Article > développement back-end > 超实用的PHP代码片段,_PHP教程
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。
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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( $newimage );
?>
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源码
一段伟大的代码片段能够轻松的从网页中提取关键字。
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$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( $keywords );
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源码
使用DOM,你可以轻松从任何页面上抓取链接,代码示例如下:
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$html = file_get_contents ( 'http://www.example.com' );
$dom = new DOMDocument();
@ $dom ->loadHTML( $html );
// grab all the on the page
$xpath = new DOMXPath( $dom );
<code class="php variable">$hrefs = $xpath ->evaluate( "/html/body//a" );
for ( $i = 0; $i <code class="php variable">$hrefs ->length; $i ++) {
$href = <code class="php variable">$hrefs->item( $i );
$url = $href ->getAttribute( 'href' );
echo $url . '<br>' ;
}
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源码
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。
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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 $matches [1] . "<a href="%5C%22%24url%5C%22" rel='\"nofollow\"'>$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 , -1), array ( '.' , ',' , ';' , ':' )) === true ) {
$ret = substr ( $dest , -1);
$dest = substr ( $dest , 0, strlen ( $dest )-1);
}
return $matches [1] . "<a href="%5C%22%24dest%5C%22" rel='\"nofollow\"'>$dest</a>" . $ret ;
}
function _make_email_clickable_cb( $matches ) {
$email = $matches [2] . '@' . $matches [3];
return $matches [1] . "<a href="%5C%22mailto:%24email%5C%22">$email</a>" ;
}
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 $ret ;
}
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源码
数据URL可以直接嵌入到HTML/CSS/JS中,以节省大量的 HTTP请求。 下面的这段代码可利用$file轻松创建数据URL。
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function data_uri( $file , $mime ) {
$contents = file_get_contents ( $file );
$base64 = base64_encode ( $contents );
echo "data:$mime;base64,$base64" ;
}
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源码
当你在搭建网站时,从远程服务器下载某张图片并且将其保存在自己的服务器上,这一操作会经常用到。代码如下:
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$image = file_get_contents ( 'http://www.url.com/image.jpg' );
file_put_contents ( '/images/image.jpg' , $image ); //Where to save the image
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源码
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。
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function cleanHTML( $html ) {
/// <summary></summary>
/// 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
}
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源码
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。
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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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源码
如果你的网站或者博客上有内链的Facebook页面,你或许想知道拥有多少粉丝。这段代码将帮助你查看Facebook粉丝数,记住,别忘了在你的页面ID第二行添加该段代码。
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<?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 ;
?>
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源码
英文出自: Catswhocode