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PHP中常用的一些功能总结(归纳)

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这篇文章给大家介绍的内容是关于PHP中常用的一些功能总结(归纳),有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。

1.获取网站是http还是https ?

$http_type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] ==

'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &&

$_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' :

'http://';

2.删除数组中的空数据

function where_data($data)

            {

                foreach ($data as $k => $v) {

                    if (empty($v) && $v !='0') {

                        unset($data[$k]);

                    }

                }

                return $data;

            }

3.截取富文本中的其中一部分

/**

 * 将富文本中文字截取其中的一部分

 * @param $content

 * @return string

 */

function html_substr_content($content,$length=100)

{

    $content = htmlspecialchars_decode($content);      //把一些预定义的 HTML 实体转换为字符

    $content = str_replace(" ", "", $content);     //将空格替换成空

    $content = strip_tags($content);                 //函数剥去字符串中的 HTML、XML 以及 PHP 的标签,获取纯文本内容

    $con = mb_substr($content, 0, $length, "utf-8");   //返回字符串中的前100字符串长度的字符

    return $con;

}

一、黑名单过滤

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、随机颜色生成器

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、从网上下载文件

 

set_time_limit(0);

            // Supports all file types

            // URL Here:

            $url = 'http://php.cn/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、强制下载文件

$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;

}

五、截取图片

$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);

六、检查网站是否宕机

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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