6个超实用的PHP代码片段
发布:smiling 来源: PHP粉丝网 添加日期:2021-06-16 10:43:04 浏览: 评论:0
这篇文章主要介绍了10个超实用的PHP代码样例:黑名单过滤、随机颜色生成器、从网上下载文件、强制下载文件、截取图片、检查网站是否宕机,需要的朋友可以参考下
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://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、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";
以上就是6个超实用的PHP代码样例,希望对大家学习PHP编程有所帮助,果断收藏吧
Tags: PHP代码片段
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