开发者必备,超实用的PHP代码片段!
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。
01.
<?
02.
error_reporting
(0);
03.
Header(
"Content-Type: image/jpeg"
);
04.
05.
//Get IP
06.
if
(!
empty
empty
(
$_SERVER
[
‘HTTP_CLIENT_IP‘
]))
07.
{
08.
$ip
=
$_SERVER
[
‘HTTP_CLIENT_IP‘
];
09.
}
10.
elseif
(!
empty
empty
(
$_SERVER
[
‘HTTP_X_FORWARDED_FOR‘
]))
11.
{
12.
$ip
=
$_SERVER
[
‘HTTP_X_FORWARDED_FOR‘
];
13.
}
14.
else
15.
{
16.
$ip
=
$_SERVER
[
‘REMOTE_ADDR‘
];
17.
}
18.
19.
//Time
20.
$actual_time
= time();
21.
$actual_day
=
date
(
‘Y.m.d‘
,
$actual_time
);
22.
$actual_day_chart
=
date
(
‘d/m/y‘
,
$actual_time
);
23.
$actual_hour
=
date
(
‘H:i:s‘
,
$actual_time
);
24.
25.
//GET Browser
26.
$browser
=
$_SERVER
[
‘HTTP_USER_AGENT‘
];
27.
28.
//LOG
29.
$myFile
=
"log.txt"
;
30.
$fh
=
fopen
(
$myFile
,
‘a+‘
);
31.
$stringData
=
$actual_day
.
‘ ‘
.
$actual_hour
.
‘ ‘
.
$ip
.
‘ ‘
.
$browser
.
‘ ‘
.
"\r\n"
;
32.
fwrite(
$fh
,
$stringData
);
33.
fclose(
$fh
);
34.
35.
//Generate Image (Es. dimesion is 1x1)
36.
$newimage
= ImageCreate(1,1);
37.
$grigio
= ImageColorAllocate(
$newimage
,255,255,255);
38.
ImageJPEG(
$newimage
);
39.
ImageDestroy(
$newimage
);
40.
41.
?>
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。
01.
$meta
= get_meta_tags(
‘http://www.emoticode.net/‘
);
02.
$keywords
=
$meta
[
‘keywords‘
];
03.
// Split keywords
04.
$keywords
=
explode
(
‘,‘
,
$keywords
);
05.
// Trim them
06.
$keywords
=
array_map
(
‘trim‘
,
$keywords
);
07.
// Remove empty values
08.
$keywords
=
array_filter
(
$keywords
);
09.
10.
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:
01.
$html
=
file_get_contents
(
‘http://www.php100.com‘
);
02.
03.
$dom
=
new
DOMDocument();
04.
@
$dom
->loadHTML(
$html
);
05.
06.
// grab all the on the page
07.
$xpath
=
new
DOMXPath(
$dom
);
08.
$hrefs
=
$xpath
->evaluate(
"/html/body//a"
);
09.
10.
for
(
$i
= 0;
$i
<
$hrefs
->length;
$i
++) {
11.
$href
=
$hrefs
->item(
$i
);
12.
$url
=
$href
->getAttribute(
‘href‘
);
13.
echo
$url
.
‘<br />‘
;
14.
}
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。
01.
function
_make_url_clickable_cb(
$matches
) {
02.
$ret
=
‘‘
;
03.
$url
=
$matches
[2];
04.
05.
if
(
empty
empty
(
$url
) )
06.
return
$matches
[0];
07.
// removed trailing [.,;:] from URL
08.
if
( in_array(
substr
(
$url
, -1),
array
(
‘.‘
,
‘,‘
,
‘;‘
,
‘:‘
)) === true ) {
09.
$ret
=
substr
(
$url
, -1);
10.
$url
=
substr
(
$url
, 0,
strlen
(
$url
)-1);
11.
}
12.
return
$matches
[1] .
"<a href=\"$url\" rel=\"nofollow\">$url</a>"
.
$ret
;
13.
}
14.
15.
function
_make_web_ftp_clickable_cb(
$matches
) {
16.
$ret
=
‘‘
;
17.
$dest
=
$matches
[2];
18.
$dest
=
‘http://‘
.
$dest
;
19.
20.
if
(
empty
empty
(
$dest
) )
21.
return
$matches
[0];
22.
// removed trailing [,;:] from URL
23.
if
( in_array(
substr
(
$dest
, -1),
array
(
‘.‘
,
‘,‘
,
‘;‘
,
‘:‘
)) === true ) {
24.
$ret
=
substr
(
$dest
, -1);
25.
$dest
=
substr
(
$dest
, 0,
strlen
(
$dest
)-1);
26.
}
27.
return
$matches
[1] .
"<a href=\"$dest\" rel=\"nofollow\">$dest</a>"
.
$ret
;
28.
}
29.
30.
function
_make_email_clickable_cb(
$matches
) {
31.
$email
=
$matches
[2] .
‘@‘
.
$matches
[3];
32.
return
$matches
[1] .
"<a href=\"mailto:$email\">$email</a>"
;
33.
}
34.
35.
function
make_clickable(
$ret
) {
36.
$ret
=
‘ ‘
.
$ret
;
37.
// in testing, using arrays here was found to be faster
38.
$ret
= preg_replace_callback(
‘#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is‘
,
‘_make_url_clickable_cb‘
,
$ret
);
39.
$ret
= preg_replace_callback(
‘#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is‘
,
‘_make_web_ftp_clickable_cb‘
,
$ret
);
40.
$ret
= preg_replace_callback(
‘#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i‘
,
‘_make_email_clickable_cb‘
,
$ret
);
41.
42.
// this one is not in an array because we need it to run last, for cleanup of accidental links within links
43.
$ret
= preg_replace(
"#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i"
,
"$1$3</a>"
,
$ret
);
44.
$ret
= trim(
$ret
);
45.
return
$ret
;
46.
}
五、创建数据URL
数据URL可以直接嵌入到HTML/CSS/JS中,以节省大量的 HTTP请求。 下面的这段代码可利用$file轻松创建数据URL。
1.
function
data_uri(
$file
,
$mime
) {
2.
$contents
=
file_get_contents
(
$file
);
3.
$base64
=
base64_encode
(
$contents
);
4.
echo
"data:$mime;base64,$base64"
;
5.
}
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:
1.
$image
=
file_get_contents
(
‘http://www.php100.com/image.jpg‘
);
2.
file_put_contents
(
‘/images/image.jpg‘
,
$image
);
//Where to save the 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。
01.
function
cleanHTML(
$html
) {
02.
/// <summary>
03.
/// Removes all FONT and SPAN tags, and all Class and Style attributes.
04.
/// Designed to get rid of non-standard Microsoft Word HTML tags.
05.
/// </summary>
06.
// start by completely removing all unwanted tags
07.
08.
$html
=
ereg_replace
(
"<(/)?(font|span|del|ins)[^>]*>"
,
""
,
$html
);
09.
10.
// then run another pass over the html (twice), removing unwanted attributes
11.
12.
$html
=
ereg_replace
(
"<([^>]*)(class|lang|style|size|face)=("
[^
"]*"
|
‘[^‘
]*‘|[^>]+)([^>]*)>
","
<\1>",
$html
);
13.
$html
=
ereg_replace
(
"<([^>]*)(class|lang|style|size|face)=("
[^
"]*"
|
‘[^‘
]*‘|[^>]+)([^>]*)>
","
<\1>",
$html
);
14.
15.
return
$html
16.
}
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。
01.
function
get_client_language(
$availableLanguages
,
$default
=
‘en‘
){
02.
if
(isset(
$_SERVER
[
‘HTTP_ACCEPT_LANGUAGE‘
])) {
03.
$langs
=
explode
(
‘,‘
,
$_SERVER
[
‘HTTP_ACCEPT_LANGUAGE‘
]);
04.
05.
foreach
(
$langs
as
$value
){
06.
$choice
=
substr
(
$value
,0,2);
07.
if
(in_array(
$choice
,
$availableLanguages
)){
08.
return
$choice
;
09.
}
10.
}
11.
}
12.
return
$default
;
13.
}
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。
1.
<?php
2.
$page_id
=
"YOUR PAGE-ID"
;
3.
$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"
);
4.
$fans
=
$xml
->page->fan_count;
5.
echo
$fans
;
6.
?>
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