转 http://www.csdn.net/article/2013-11-01/2817365-useful-snippets-for-php-developers
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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二、从网友中提取关键字
一段伟大的代码片段能够轻松的从网页中提取关键字。
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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( $keywords );
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三、查找页面上的所有链接
使用DOM,你可以轻松从任何页面上抓取链接,代码示例如下:
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$html = file_get_contents(
'http://www.example.com'
);
$dom =
new
DOMDocument();
@$dom->loadHTML($html);
// grab all the on the page
$xpath =
new
DOMXPath($dom);
$hrefs = $xpath->evaluate(
"/html/body//a"
);
for
($i = 0; $i < $hrefs->length; $i++) {
$href = $hrefs->item($i);
$url = $href->getAttribute(
'href'
);
echo $url.
'<br />'
;
}
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四、自动转换URL,跳转至超链接
在WordPress中,如果你想自动转换URL,跳转至超链接页面,你可以利用内置的函数make_clickable()执行此操作。如果你想基于WordPress之外操作该程序,那么你可以参考wp-includes/formatting.php源代码。
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function
_make_url_clickable_cb($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
$matches[1] .
"<a href=\"$url\" 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
$matches[1] .
"<a href=\"$dest\" rel=\"nofollow\">$dest</a>"
. $ret;
}
function
_make_email_clickable_cb($matches) {
$email = $matches[2] .
'@'
. $matches[3];
return
$matches[1] .
"<a href=\"mailto:$email\">$email</a>"
;
}
function
make_clickable($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(
"#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i"
,
"$1$3</a>"
, $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。
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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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六、从服务器上下载&保存一个远程图片
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'
, $image);
//Where to save the image
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七、移除Remove Microsoft Word HTML Tag
当你使用Microsoft Word会创建许多Tag,比如font,span,style,class等。这些标签对于Word本身而言是非常有用的,但是当你从Word粘贴至网页时,你会发现很多无用的Tag。因此,下面的这段代码可帮助你删除所有无用的Word HTML Tag。
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function
cleanHTML($html) {
/// <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
$html = ereg_replace(
"<(/)?(font|span|del|ins)[^>]*>"
,
""
,$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
$html
}
|
八、检测浏览器语言
如果你的网站上有多种语言,那么可以使用这段代码作为默认的语言来检测浏览器语言。该段代码将返回浏览器客户端使用的初始语言。
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function
get_client_language($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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九、显示Facebook 粉丝数量
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;
?>
|
英文出自: Catswhocode
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