10个典型实用的PHP代码片段
10个典型实用的PHP代码片段
一、黑名单过滤
1.function is_spam($text, $file, $split = ':', $regex
= false){
2.$handle = fopen($file, 'rb');
3.$contents = fread($handle, filesize($file));
4. fclose($handle);
5.$lines = explode("n", $contents);
6.$arr = array();
7.foreach($lines as$line){
8.list($word, $count) = explode($split, $line);
9.if($regex)
10.$arr[$word] = $count;
11.else
12.$arr[preg_quote($word)] = $count;
13.}
14.preg_match_all("~".implode('|', array_keys($arr))."
~", $text, $matches);
15.$temp = array();
16.foreach($matches[0] as$match){
17.if(!in_array($match, $temp)){
18.$temp[$match] = $temp[$match] + 1;
19.if($temp[$match] >= $arr[$word])
20.return true;
21.}
22.}
23.return false;
24.}
25.
26.$file = 'spam.txt';
27.$str = 'This string has cat, dog word';
28.if(is_spam($str, $file))
29.echo 'this is spam';
30.else
31.echo 'this is not spam';
32.
33.ab:3
34.dog:3
35.cat:2
36.monkey:2
二、随机颜色生成器
1.function randomColor() {
2.$str = '#';
3.for($i = 0 ; $i < 6 ; $i++) {
4.$randNum = rand(0 , 15);
5.switch ($randNum) {
6.case 10: $randNum = 'A'; break;
7.case 11: $randNum = 'B'; break;
8.case 12: $randNum = 'C'; break;
9.case 13: $randNum = 'D'; break;
10.case 14: $randNum = 'E'; break;
11.case 15: $randNum = 'F'; break;
12. }
13.$str .= $randNum;
14. }
15.return$str;
16.}
17.$color = randomColor();
三、从网上下载文件
1.set_time_limit(0);
2.// Supports all file types
3.// URL Here:
4.$url = 'https://www.wendangku.net/doc/a44651495.html,/some_video.flv';
5.$pi = pathinfo($url);
6.$ext = $pi['extension'];
7.$name = $pi['filename'];
8.
9.// create a new cURL resource
10.$ch = curl_init();
11.
12.// set URL and other appropriate options
13.curl_setopt($ch, CURLOPT_URL, $url);
14.curl_setopt($ch, CURLOPT_HEADER, false);
15.curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
16.curl_setopt($ch, CURLOPT_AUTOREFERER, true);
17.curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
18.curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
19.
20.// grab URL and pass it to the browser
21.$opt = curl_exec($ch);
22.
23.// close cURL resource, and free up system resources
24.curl_close($ch);
25.
26.$saveFile = $name.'.'.$ext;
27.if(preg_match("/[^0-9a-z._-]/i", $saveFile))
28.$saveFile = md5(microtime(true)).'.'.$ext;
29.
30.$handle = fopen($saveFile, 'wb');
31.fwrite($handle, $opt);
32.fclose($handle);
四、Alexa/Google Page Rank
1.function page_rank($page, $type = 'alexa'){
2.switch($type){
3.case'alexa':
4.$url = 'https://www.wendangku.net/doc/a44651495.html,/siteinfo/';
5.$handle = fopen($url.$page, 'r');
6.break;
7.case'google':
8.$url = 'https://www.wendangku.net/doc/a44651495.html,/search?client=navclient-au
to&ch=6-1484155081&features=Rank&q=info:';
9.$handle = fopen($url.'http://'.$page, 'r');
10.break;
11.}
12.$content = stream_get_contents($handle);
13.fclose($handle);
14.$content = preg_replace("~(n|t|ss+)~",'', $content)
;
15.switch($type){
16.case'alexa':
17.if(preg_match('~
>(.+?)
18.return$matches[2];
19.}else{
20.return FALSE;
21.}
22.break;
23.case'google':
24.$rank = explode(':',$content);
25.if($rank[2] != '')
26.return$rank[2];
27.else
28.return FALSE;
29.break;
30.default:
31.return FALSE;
32.break;
33.}
34.}
35.// Alexa Page Rank:
36.echo 'Alexa Rank: '.page_rank('https://www.wendangku.net/doc/a44651495.html,');
37.echo ' ';
38.// Google Page Rank
39.echo 'Google Rank: '.page_rank('https://www.wendangku.net/doc/a44651495.html,', 'googl
e');
五、强制下载文件
1.$filename = $_GET['file']; //Get the fileid from the URL
2.// Query the file ID
3.$query = sprintf("SELECT * FROM tableName WHERE id =
'%s'",mysql_real_escape_string($filename));
4.$sql = mysql_query($query);
5.if(mysql_num_rows($sql) > 0){
6.$row = mysql_fetch_array($sql);
7.// Set some headers
8.header("Pragma: public");
9.header("Expires: 0");
10.header("Cache-Control: must-revalidate, post-check=
0, pre-check=0");
11.header("Content-Type: application/force-download");
12.header("Content-Type: application/octet-stream");
13.header("Content-Type: application/download");
14.header("Content-Disposition: attachment; filename="
.basename($row['FileName']).";");
15.header("Content-Transfer-Encoding: binary");
16.header("Content-Length: ".filesize($row['FileName']
));
17.
18.@readfile($row['FileName']);
19.exit(0);
20.}else{
21.header("Location: /");
22.exit;
23.}
六、用Email显示用户的Gravator头像
1.$gravatar_link = 'https://www.wendangku.net/doc/a44651495.html,/avatar/' .
md5($comment_author_email) . '?s=32';
2.echo '
七、用cURL获取RSS订阅数
1.$ch = curl_init();
2.curl_setopt($ch,CURLOPT_URL,'https://feedburner.goog
https://www.wendangku.net/doc/a44651495.html,/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rs cbplq5qgadiiq4');
3.curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
4.curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2);
5.$content = curl_exec($ch);
6.$subscribers = get_match('/circulation="(.*)"/isU',$
content);
7.curl_close($ch);
八、时间差异计算
1.function ago($time)
2.{
3. $periods = array("second", "minute", "hour", "day
", "week", "month", "year", "decade");
4.$lengths = array("60","60","24","7","4.35","12","10"
);
5.
6.$now = time();
7.
8.$difference = $now - $time;
9.$tense = "ago";
10.
11.for($j = 0; $difference >= $lengths[$j] && $j < cou
nt($lengths)-1; $j++) {
12.$difference /= $lengths[$j];
13.}
14.
15.$difference = round($difference);
16.
17.if($difference != 1) {
18.$periods[$j].= "s";
19.}
20.
21.return"$difference $periods[$j] 'ago' ";
22.}
九、截取图片
1.$filename= "test.jpg";
2.list($w, $h, $type, $attr) = getimagesize($filename)
;
3.$src_im = imagecreatefromjpeg($filename);
4.
5.$src_x = '0'; // begin x
6.$src_y = '0'; // begin y
7.$src_w = '100'; // width
8.$src_h = '100'; // height
9.$dst_x = '0'; // destination x
10.$dst_y = '0'; // destination y
11.
12.$dst_im = imagecreatetruecolor($src_w, $src_h);
13.$white = imagecolorallocate($dst_im, 255, 255, 255)
;
14.imagefill($dst_im, 0, 0, $white);
15.
16.imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x,
$src_y, $src_w, $src_h);
17.
18.header("Content-type: image/png");
19.imagepng($dst_im);
20.imagedestroy($dst_im);
十、检查网站是否宕机
1.function Visit($url){
2.$agent = "Mozilla/4.0 (compatible; MSIE 5.01;
Windows NT 5.0)";$ch=curl_init();
3.curl_setopt ($ch, CURLOPT_URL,$url );
4.curl_setopt($ch, CURLOPT_USERAGENT, $agent);
5.curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
6.curl_setopt ($ch,CURLOPT_VERBOSE,false);
7.curl_setopt($ch, CURLOPT_TIMEOUT, 5);
8.curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE);
9.curl_setopt($ch,CURLOPT_SSLVERSION,3);
10.curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, FALSE);
11.$page=curl_exec($ch);
12.//echo curl_error($ch);
13.$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
14.curl_close($ch);
15.if($httpcode>=200 && $httpcode<300) return true;
16.else return false;
17.}
18.if (Visit("https://www.wendangku.net/doc/a44651495.html,"))
19.echo "Website OK"."n";
20.else
21.echo "Website DOWN";
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