10 super useful PHP code that must be added to favorites

As a normal programmer, it will be quite normal for several languages. I believe most programmers will write a few PHP programs. if they are WEB programmers, PHP must be necessary, even if you haven't used it to develop large software projects, you must have a certain understanding of its syntax. As a normal programmer, it will be quite normal for several languages. I believe most programmers will write a few PHP programs. if they are WEB programmers, PHP must be necessary, even if you haven't used it to develop large software projects, you must have a certain understanding of its syntax.

Although PHP is often criticized, devalued, and joke, it turns out that PHP is the most popular programming language in website development around the world. The biggest disadvantage of PHP is that it is too simple, the syntax is not rigorous, and the framework system is weak. but this is also its biggest advantage. an ordinary person with a programming background only needs to study PHP for half a day, you can get started with developing web applications.

Some people on the Internet summarize the features of several programming languages, which I think makes sense:

PHP is: Quick and Dirty
Java is: Beauty and Slowly
Ruby is: Quick and Beauty
Python is Quick and Simple.

In the popularity of PHP, a lot of practical PHP code snippets have been summarized on the internet. these code snippets can be used when you encounter similar problems and pasted in the past, which is very efficient, it saves time and effort. Putting the excellent code summarized by these programmers into their own knowledge base is a good habit for learning programmers.

I. blacklist filtering

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:3dog:3cat:2monkey:2

II. random color generator

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();

3. download files from the network

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);

IV. 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('~
(.+?) 
~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');

5. Force File Download

$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; }

6. show your Gravatar Avatar by Email

 $gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';  echo '';

7. obtain the number of RSS subscriptions through cURL

$ch = curl_init();curl_setopt($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);

VIII. time difference calculation functions

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' ";}

9. crop images

$filename= "test.jpg";list($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);

10. check whether the website is down

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";

The above is a detailed description of 10 super useful PHP code that must be added to the favorites. For more information, see The PHP Chinese website (www.php1.cn )!