10 super useful PHP code snippets worth collecting, _PHP Tutorial

10 super useful PHP code snippets worth collecting,

Although PHP is often criticized, belittled, and treated as a joke, facts have proven that PHP is the most commonly used programming language in website development in the world. The biggest disadvantage of PHP is that it is too simple, the syntax is not rigorous, and the framework system is very weak, but this is also its biggest advantage. An ordinary person with a bit of programming background can start developing web applications in just half a day of learning PHP.

Someone on the Internet summarized the characteristics of several programming languages, which I think makes sense:

Copy code The code is as follows:

PHP is: Quick and Dirty
Java is: Beauty and Slowly
Ruby is: Quick and Beauty
python is: Quick and Simple

With the popularity of PHP, many practical PHP code snippets have been summarized on the Internet. These code snippets can be used when you encounter similar problems by pasting them in. They are very efficient and save time and effort. Putting the excellent codes summarized by these senior programmers into your own knowledge base is a good habit of a programmer who is good at learning.

1. Blacklist filtering

Copy code The code is as follows:

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

2. Random color generator

Copy code The code is as follows:

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 Internet

Copy code The code is as follows:

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('~

(.+?)

~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、强制下载文件

复制代码 代码如下:

$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、通过Email显示用户的Gravatar头像

复制代码 代码如下:

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

七、通过cURL获取RSS订阅数

复制代码 代码如下:

$ch = curl_init();
curl_setopt($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、时间差异计算函数

复制代码 代码如下:

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、裁剪图片

复制代码 代码如下:

$filename= "test.jpg";
list($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、检查网站是否宕机

复制代码 代码如下:

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";

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