幻想编程

本文将介绍10个经常会用到的PHP代码片段，包括黑名单过滤、随机颜色生成器、从网上下载文件、Alexa/Google Page Rank、强制下载文件、用Email显示用户的Gravator头像、用cURL获取RSS订阅数、截取图片、检查网站是否宕机。

一、黑名单过滤

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';

ab:3

dog:3

cat:2

monkey:2

二、随机颜色生成器

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、从网上下载文件

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

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

$$filename = $$_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、用Email显示用户的Gravator头像

$$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($$comment_author_email) . '?s=32';

echo '<img src="' . $$gravatar_link . '" />';

七、用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

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、截取图片

$$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

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";