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；如果你是WEB程序员，那么PHP是必备的一门语言，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
- Java就是： Beauty and Slowly
- Ruby就是： Quick and Beauty
- python就是： Quick and Simple
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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| 1function 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';
28if(is_spam($str, $file))
29 echo 'this is spam';
30else
31 echo 'this is not spam';
32 |
输出：
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| 1ab:3
2dog:3
3cat:2
4monkey:2
5 |
二、随机颜色生成器
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| 1function 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();
18 |
三、从网络下载文件
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| 1set_time_limit(0);
2// Supports all file types
3// URL Here:
4$url = 'http://somsite.com/some_video.flv';
5$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
13curl_setopt($ch, CURLOPT_URL, $url);
14curl_setopt($ch, CURLOPT_HEADER, false);
15curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
16curl_setopt($ch, CURLOPT_AUTOREFERER, true);
17curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
18curl_setopt($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
24curl_close($ch);
25
26$saveFile = $name.'.'.$ext;
27if(preg_match("/[^0-9a-z._-]/i", $saveFile))
28$saveFile = md5(microtime(true)).'.'.$ext;
29
30$handle = fopen($saveFile, 'wb');
31fwrite($handle, $opt);
32fclose($handle);
33 |
四、Alexa/Google Page Rank
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| 1function page_rank($page, $type = 'alexa'){
2 switch($type){
3 case 'alexa':
4 $url = 'http://alexa.com/siteinfo/';
5 $handle = fopen($url.$page, 'r');
6 break;
7 case 'google':
8 $url = 'http://google.com/search?client=navclient-auto&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('~<div class="data (down|up)"><img.+?>(.+?) </div>~im',$content,$matches)){
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 $rank[2];
27 else
28 return FALSE;
29 break;
30 default:
31 return FALSE;
32 break;
33 }
34}
35// Alexa Page Rank:
36echo 'Alexa Rank: '.page_rank('techug.com');
37echo '
38';
39// Google Page Rank
40echo 'Google Rank: '.page_rank('techug.com', 'google');
41 |
五、强制下载文件
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| 1$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($query);
5if(mysql_num_rows($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($row['FileName']);
19 exit(0);
20}else{
21 header("Location: /");
22 exit;
23}
24 |
六、通过Email显示用户的Gravatar头像
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| 1$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';
2echo '<img src="' . $gravatar_link . '" />';
3 |
七、通过cURL获取RSS订阅数
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| 1$ch = curl_init();
2curl_setopt($ch,CURLOPT_URL,'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4');
3curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
4curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2);
5$content = curl_exec($ch);
6$subscribers = get_match('/circulation="(.*)"/isU',$content);
7curl_close($ch);
8 |
八、时间差异计算函数
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| 1function 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 $now = time();
6 $difference = $now - $time;
7 $tense = "ago";
8 for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
9 $difference /= $lengths[$j];
10 }
11 $difference = round($difference);
12 if($difference != 1) {
13 $periods[$j].= "s";
14 }
15 return "$difference $periods[$j] 'ago' ";
16}
17 |
九、裁剪图片
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| 1$filename= "test.jpg";
2list($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($dst_im, 255, 255, 255);
14imagefill($dst_im, 0, 0, $white);
15
16imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h);
17
18header("Content-type: image/png");
19imagepng($dst_im);
20imagedestroy($dst_im);
21 |
十、检查网站是否宕机
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| 1function Visit($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}
18if (Visit("http://www.google.com"))
19 echo "Website OK"."n";
20else
21 echo "Website DOWN";
22 |
