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10个典型实用的PHP代码片段_PHP教程

时间：2021-07-01 10:21:17 帮助过：6人阅读

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

  1. function is_spam($text, $file, $split = ':https://www.gxlcms.com/', $regex = false){ 
  2.     $handle = fopen($file, 'rbhttps://www.gxlcms.com/'); 
  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)] = $count; 
  13. } 
  14. preg_match_all("~".implode('|https://www.gxlcms.com/', array_keys($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.txthttps://www.gxlcms.com/'; 
  27. $str = 'This string has cat, dog wordhttps://www.gxlcms.com/'; 
  28. if(is_spam($str, $file)) 
  29. echo 'this is spamhttps://www.gxlcms.com/'; 
  30. else 
  31. echo 'this is not spamhttps://www.gxlcms.com/'; 
  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.     $str = '#https://www.gxlcms.com/'; 
  3.     for($i = 0 ; $i < 6 ; $i++) { 
  4.         $randNum = rand(0 , 15); 
  5.         switch ($randNum) { 
  6.             case 10: $randNum = 'Ahttps://www.gxlcms.com/'; break; 
  7.             case 11: $randNum = 'Bhttps://www.gxlcms.com/'; break; 
  8.             case 12: $randNum = 'Chttps://www.gxlcms.com/'; break; 
  9.             case 13: $randNum = 'Dhttps://www.gxlcms.com/'; break; 
  10.             case 14: $randNum = 'Ehttps://www.gxlcms.com/'; break; 
  11.             case 15: $randNum = 'Fhttps://www.gxlcms.com/'; 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 = 'http://somsite.com/some_video.flvhttps://www.gxlcms.com/'; 
  5. $pi = pathinfo($url); 
  6. $ext = $pi['extensionhttps://www.gxlcms.com/']; 
  7. $name = $pi['filenamehttps://www.gxlcms.com/']; 
  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 = $name.'.https://www.gxlcms.com/'.$ext; 
  27. if(preg_match("/[^0-9a-z._-]/i", $saveFile)) 
  28. $saveFile = md5(microtime(true)).'.https://www.gxlcms.com/'.$ext; 
  29.  
  30. $handle = fopen($saveFile, 'wbhttps://www.gxlcms.com/'); 
  31. fwrite($handle, $opt); 
  32. fclose($handle);

四、Alexa/Google Page Rank

  1. function page_rank($page, $type = 'alexahttps://www.gxlcms.com/'){ 
  2. switch($type){ 
  3. case 'alexahttps://www.gxlcms.com/': 
  4. $url = 'http://alexa.com/siteinfo/https://www.gxlcms.com/'; 
  5. $handle = fopen($url.$page, 'rhttps://www.gxlcms.com/'); 
  6. break; 
  7. case 'googlehttps://www.gxlcms.com/': 
  8. $url = 'http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:https://www.gxlcms.com/'; 
  9. $handle = fopen($url.'http://https://www.gxlcms.com/'.$page, 'rhttps://www.gxlcms.com/'); 
  10. break; 
  11. } 
  12. $content = stream_get_contents($handle); 
  13. fclose($handle); 
  14. $content = preg_replace("~(n|t|ss+)~",'https://www.gxlcms.com/', $content); 
  15. switch($type){ 
  16. case 'alexahttps://www.gxlcms.com/': 
  17. if(preg_match('~(.+?) ~imhttps://www.gxlcms.com/',$content,$matches)){ 
  18. return $matches[2]; 
  19. }else{ 
  20. return FALSE; 
  21. } 
  22. break; 
  23. case 'googlehttps://www.gxlcms.com/': 
  24. $rank = explode(':https://www.gxlcms.com/',$content); 
  25. if($rank[2] != 'https://www.gxlcms.com/') 
  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: https://www.gxlcms.com/'.page_rank('techug.comhttps://www.gxlcms.com/'); 
  37. echo ' https://www.gxlcms.com/'; 
  38. // Google Page Rank 
  39. echo 'Google Rank: https://www.gxlcms.com/'.page_rank('techug.comhttps://www.gxlcms.com/', 'googlehttps://www.gxlcms.com/');

五、强制下载文件

  1. $filename = $_GET['filehttps://www.gxlcms.com/']; //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($row['FileNamehttps://www.gxlcms.com/']).";"); 
  15. header("Content-Transfer-Encoding: binary"); 
  16. header("Content-Length: ".filesize($row['FileNamehttps://www.gxlcms.com/'])); 
  17.  
  18. @readfile($row['FileNamehttps://www.gxlcms.com/']); 
  19. exit(0); 
  20. }else{ 
  21. header("Location: /"); 
  22. exit; 
  23. }

六、用Email显示用户的Gravator头像

  1. $gravatar_link = 'http://www.gravatar.com/avatar/https://www.gxlcms.com/' . md5($comment_author_email) . '?s=32https://www.gxlcms.com/'; 
  2. echo '$gravatar_link . '" />https://www.gxlcms.com/';

七、用cURL获取RSS订阅数

  1. $ch = curl_init(); 
  2. curl_setopt($ch,CURLOPT_URL,'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4https://www.gxlcms.com/'); 
  3. curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); 
  4. curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2); 
  5. $content = curl_exec($ch); 
  6. $subscribers = get_match('/circulation="(.*)"/isUhttps://www.gxlcms.com/',$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] && $j < count($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 = '0https://www.gxlcms.com/'; // begin x 
  6. $src_y = '0https://www.gxlcms.com/'; // begin y 
  7. $src_w = '100https://www.gxlcms.com/'; // width 
  8. $src_h = '100https://www.gxlcms.com/'; // height 
  9. $dst_x = '0https://www.gxlcms.com/'; // destination x 
  10. $dst_y = '0https://www.gxlcms.com/'; // 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("http://www.google.com")) 
  19. echo "Website OK"."n"; 
  20. else 
  21. echo "Website DOWN";

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/1059208.htmlTechArticle10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 Pag...

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