10个典型实用的PHP代码片段
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";