作为一个正常的程序员，会好几种语言是十分正常的，相信大部分程序员也都会编写几句PHP程序，如果是WEB程序员，PHP一定是必备的，即使你没用它开发过大型软件项目，也一定多少了解它的语法。
尽管PHP经常被人诟病，被人贬低，被人当玩笑开，事实证明，PHP是全世界网站开发中使用率最高的编程语言。PHP最大的缺点是太简单，语法不严谨，框架体系很弱，但这也是它最大的优点，一个有点编程背景的普通人，只需要学习PHP半天时间，就可以上手开始开发web应用了。
网上有人总结几种编程语言的特点，我觉得也挺有道理的：
PHP 就是： Quick and Dirty
在PHP的流行普及中，网上总结出了很多实用的PHP代码片段，这些代码片段在当你遇到类似的问题时，粘贴过去就可以使用，非常的高效，非常的省时省力。将这些程序员前辈总结出的优秀代码放到自己的知识库中，是一个善于学习的程序员的好习惯。
一、黑名单过滤
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function is_spam ( $ text , $ file , $ split = ':' , $ regex = false ) {
$ handle = fopen ( $ file , 'rb' ) ;
$ contents = fread ( $ handle , filesize ( $ file ) ) ;
fclose ( $ handle ) ;
$ lines = explode ( "n" , $ contents ) ;
$ arr = array ( ) ;
foreach ( $ lines as $ line ) {
list ( $ word , $ count ) = explode ( $ split , $ line ) ;
if ( $ regex )
$ arr [ $ word ] = $ count ;
else
$ arr [ preg_quote ( $ word ) ] = $ count ;
}
preg_match_all ( "~" . implode ( '|' , array_keys ( $ arr ) ) . "~" , $ text , $ matches ) ;
$ temp = array ( ) ;
foreach ( $ matches [ 0 ] as $ match ) {
if ( ! in_array ( $ match , $ temp ) ) {
$ temp [ $ match ] = $ temp [ $ match ] + 1 ;
if ( $ temp [ $ match ] >= $ arr [ $ word ] )
return true ;
}
}
return false ;
}
$ file = 'spam.txt' ;
$ str = 'This string has cat, dog word' ;
if ( is_spam ( $ str , $ file ) )
echo 'this is spam' ;
else
echo 'this is not spam' ;
二、随机颜色生成器
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function randomColor ( ) {
$ str = '#' ;
for ( $ i = 0 ; $ i < 6 ; $ i ++ ) {
$ randNum = rand ( 0 , 15 ) ;
switch ( $ randNum ) {
case 10 : $ randNum = 'A' ; break ;
case 11 : $ randNum = 'B' ; break ;
case 12 : $ randNum = 'C' ; break ;
case 13 : $ randNum = 'D' ; break ;
case 14 : $ randNum = 'E' ; break ;
case 15 : $ randNum = 'F' ; break ;
}
$ str . = $ randNum ;
}
return $ str ;
}
$ color = randomColor ( ) ;
三、从网络下载文件
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set_time_limit ( 0 ) ;
// Supports all file types
// URL Here:
$ url = 'http://somsite.com/some_video.flv' ;
$ pi = pathinfo ( $ url ) ;
$ ext = $ pi [ 'extension' ] ;
$ name = $ pi [ 'filename' ] ;
// create a new cURL resource
$ ch = curl_init ( ) ;
// set URL and other appropriate options
curl_setopt ( $ ch , CURLOPT_URL , $ url ) ;
curl_setopt ( $ ch , CURLOPT_HEADER , false ) ;
curl_setopt ( $ ch , CURLOPT_BINARYTRANSFER , true ) ;
curl_setopt ( $ ch , CURLOPT_AUTOREFERER , true ) ;
curl_setopt ( $ ch , CURLOPT_FOLLOWLOCATION , true ) ;
curl_setopt ( $ ch , CURLOPT_RETURNTRANSFER , true ) ;
// grab URL and pass it to the browser
$ opt = curl_exec ( $ ch ) ;
// close cURL resource, and free up system resources
curl_close ( $ ch ) ;
$ saveFile = $ name . '.' . $ ext ;
if ( preg_match ( "/[^0-9a-z._-]/i" , $ saveFile ) )
$ saveFile = md5 ( microtime ( true ) ) . '.' . $ ext ;
$ handle = fopen ( $ saveFile , 'wb' ) ;
fwrite ( $ handle , $ opt ) ;
fclose ( $ handle ) ;
四、Alexa/Google Page Rank
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function page_rank ( $ page , $ type = 'alexa' ) {
switch ( $ type ) {
case 'alexa' :
$ url = 'http://alexa.com/siteinfo/' ;
$ handle = fopen ( $ url . $ page , 'r' ) ;
break ;
case 'google' :
$ url = 'http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:' ;
$ handle = fopen ( $ url . 'http://' . $ page , 'r' ) ;
break ;
}
$ content = stream_get_contents ( $ handle ) ;
fclose ( $ handle ) ;
$ content = preg_replace ( "~(n|t|ss+)~" , '' , $ content ) ;
switch ( $ type ) {
case 'alexa' :
if ( preg_match ( '~<div class="data (down|up)"><img.+?>(.+?) </div>~im' , $ content , $ matches ) ) {
return $ matches [ 2 ] ;
} else {
return FALSE ;
}
break ;
case 'google' :
$ rank = explode ( ':' , $ content ) ;
if ( $ rank [ 2 ] != '' )
return $ rank [ 2 ] ;
else
return FALSE ;
break ;
default :
return FALSE ;
break ;
}
}
// Alexa Page Rank:
echo 'Alexa Rank: ' . page_rank ( 'techug.com' ) ;
echo '
' ;
// Google Page Rank
echo 'Google Rank: ' . page_rank ( 'techug.com' , 'google' ) ;
五、强制下载文件
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$ filename = $ _GET [ 'file' ] ; //Get the fileid from the URL
// Query the file ID
$ query = sprintf ( "SELECT * FROM tableName WHERE id = '%s'" , mysql_real_escape_string ( $ filename ) ) ;
$ sql = mysql_query ( $ query ) ;
if ( mysql_num_rows ( $ sql ) > 0 ) {
$ row = mysql_fetch_array ( $ sql ) ;
// Set some headers
header ( "Pragma: public" ) ;
header ( "Expires: 0" ) ;
header ( "Cache-Control: must-revalidate, post-check=0, pre-check=0" ) ;
header ( "Content-Type: application/force-download" ) ;
header ( "Content-Type: application/octet-stream" ) ;
header ( "Content-Type: application/download" ) ;
header ( "Content-Disposition: attachment; filename=" . basename ( $ row [ 'FileName' ] ) . ";" ) ;
header ( "Content-Transfer-Encoding: binary" ) ;
header ( "Content-Length: " . filesize ( $ row [ 'FileName' ] ) ) ;
@ readfile ( $ row [ 'FileName' ] ) ;
exit ( 0 ) ;
} else {
header ( "Location: /" ) ;
exit ;
}
六、通过Email显示用户的Gravatar头像
$ gravatar_link = 'http://www.gravatar.com/avatar/' . md5 ( $ comment_author_email ) . '?s=32' ;
echo '<img src="' . $ gravatar _ link . '" />' ;
七、通过cURL获取RSS订阅数
$ ch = curl_init ( ) ;
curl_setopt ( $ ch , CURLOPT_URL , 'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4' ) ;
curl_setopt ( $ ch , CURLOPT_RETURNTRANSFER , 1 ) ;
curl_setopt ( $ ch , CURLOPT_CONNECTTIMEOUT , 2 ) ;
$ content = curl_exec ( $ ch ) ;
$ subscribers = get_match ( '/circulation="(.*)"/isU' , $ content ) ;
curl_close ( $ ch ) ;
八、时间差异计算函数
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function ago ( $ time )
{
$ periods = array ( "second" , "minute" , "hour" , "day" , "week" , "month" , "year" , "decade" ) ;
$ lengths = array ( "60" , "60" , "24" , "7" , "4.35" , "12" , "10" ) ;
$ now = time ( ) ;
$ difference = $ now - $ time ;
$ tense = "ago" ;
for ( $ j = 0 ; $ difference >= $ lengths [ $ j ] && $ j < count ( $ lengths ) - 1 ; $ j ++ ) {
$ difference /= $ lengths [ $ j ] ;
}
$ difference = round ( $ difference ) ;
if ( $ difference != 1 ) {
$ periods [ $ j ] . = "s" ;
}
return "$difference $periods[$j] 'ago' " ;
}
九、裁剪图片
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$ filename = "test.jpg" ;
list ( $ w , $ h , $ type , $ attr ) = getimagesize ( $ filename ) ;
$ src_im = imagecreatefromjpeg ( $ filename ) ;
$ src_x = '0' ; // begin x
$ src_y = '0' ; // begin y
$ src_w = '100' ; // width
$ src_h = '100' ; // height
$ dst_x = '0' ; // destination x
$ dst_y = '0' ; // destination y
$ dst_im = imagecreatetruecolor ( $ src_w , $ src_h ) ;
$ white = imagecolorallocate ( $ dst_im , 255 , 255 , 255 ) ;
imagefill ( $ dst_im , 0 , 0 , $ white ) ;
imagecopy ( $ dst_im , $ src_im , $ dst_x , $ dst_y , $ src_x , $ src_y , $ src_w , $ src_h ) ;
header ( "Content-type: image/png" ) ;
imagepng ( $ dst_im ) ;
imagedestroy ( $ dst_im ) ;
十、检查网站是否宕机
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function Visit ( $ url ) {
$ agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)" ; $ ch = curl_init ( ) ;
curl_setopt ( $ ch , CURLOPT_URL , $ url ) ;
curl_setopt ( $ ch , CURLOPT_USERAGENT , $ agent ) ;
curl_setopt ( $ ch , CURLOPT_RETURNTRANSFER , 1 ) ;
curl_setopt ( $ ch , CURLOPT_VERBOSE , false ) ;
curl_setopt ( $ ch , CURLOPT_TIMEOUT , 5 ) ;
curl_setopt ( $ ch , CURLOPT_SSL_VERIFYPEER , FALSE ) ;
curl_setopt ( $ ch , CURLOPT_SSLVERSION , 3 ) ;
curl_setopt ( $ ch , CURLOPT_SSL_VERIFYHOST , FALSE ) ;
$ page = curl_exec ( $ ch ) ;
//echo curl_error($ch);
$ httpcode = curl_getinfo ( $ ch , CURLINFO_HTTP_CODE ) ;
curl_close ( $ ch ) ;
if ( $ httpcode >= 200 && $ httpcode < 300 ) return true ;
else return false ;
}
if ( Visit ( "http://www.google.com" ) )
echo "Website OK" . "n" ;
else
echo "Website DOWN" ;
