欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

PHP中常用的一些功能总结(归纳)

程序员文章站 2022-04-05 23:08:17
...
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";

相关文章推荐:

什么是php引用变量?PHP中引用是如何实现

php7和php5有什么不同之处?php5与php7之间的对比

以上就是PHP中常用的一些功能总结(归纳)的详细内容,更多请关注其它相关文章!

相关标签: PHP