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 headersheader("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";elseecho "Website DOWN";
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