本文將介紹10個經常會用到的PHP代碼片段,包括黑名單過濾、隨機顏色生成器、從網上下載文件、Alexa/Google Page Rank、強制下載文件、用Email顯示用戶的Gravator頭像、用cURL獲取RSS訂閱數、截取圖片、檢查網站是否宕機。
一、黑名單過濾
- 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、隨機顏色生成器
- 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、從網上下載文件
- 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、強制下載文件
- $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顯示用戶的Gravator頭像
- $gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';
- echo '<img src="' . $gravatar_link . '" />';
七、用cURL獲取RSS訂閱數
- $ch = curl_init();
- curl_setopt($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($ch);
八、時間差異計算
- function ago($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、截取圖片
- $filename= "test.jpg";
- list($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($dst_im);
十、檢查網站是否宕機
- function Visit($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";