本文实例讲述了摘自织梦CMS的HTTP文件下载类。分享给大家供大家参考。具体如下:
<?php if(!defined('DEDEINC')) exit("Request Error!"); /** * 织梦HTTP下载类 * * @version $Id: dedehttpdown.class.php 1 11:42 2010年7月6日Z tianya $ * @package DedeCMS.Libraries * @copyright Copyright (c) 2007 - 2010, DesDev, Inc. * @license http://help.dedecms.com/usersguide/license.html * @link http://www.dedecms.com */ @set_time_limit(0); class DedeHttpDown { var $m_url = ''; var $m_urlpath = ''; var $m_scheme = 'http'; var $m_host = ''; var $m_port = '80'; var $m_user = ''; var $m_pass = ''; var $m_path = '/'; var $m_query = ''; var $m_fp = ''; var $m_error = ''; var $m_httphead = ''; var $m_html = ''; var $m_puthead = ''; var $BaseUrlPath = ''; var $HomeUrl = ''; var $reTry = 0; var $JumpCount = 0; /** * 初始化系统 * * @access public * @param string $url 需要下载的地址 * @return string */ function PrivateInit($url) { if($url=='') { return ; } $urls = ''; $urls = @parse_url($url); $this->m_url = $url; if(is_array($urls)) { $this->m_host = $urls["host"]; if(!empty($urls["scheme"])) { $this->m_scheme = $urls["scheme"]; } if(!empty($urls["user"])) { $this->m_user = $urls["user"]; } if(!empty($urls["pass"])) { $this->m_pass = $urls["pass"]; } if(!empty($urls["port"])) { $this->m_port = $urls["port"]; } if(!empty($urls["path"])) { $this->m_path = $urls["path"]; } $this->m_urlpath = $this->m_path; if(!empty($urls["query"])) { $this->m_query = $urls["query"]; $this->m_urlpath .= "?".$this->m_query; } $this->HomeUrl = $urls["host"]; $this->BaseUrlPath = $this->HomeUrl.$urls["path"]; $this->BaseUrlPath = preg_replace("/\/([^\/]*)\.(.*)$/","/",$this->BaseUrlPath); $this->BaseUrlPath = preg_replace("/\/$/","",$this->BaseUrlPath); } } /** * 重设各参数 * * @access public * @return void */ function ResetAny() { $this->m_url = ""; $this->m_urlpath = ""; $this->m_scheme = "http"; $this->m_host = ""; $this->m_port = "80"; $this->m_user = ""; $this->m_pass = ""; $this->m_path = "/"; $this->m_query = ""; $this->m_error = ""; } /** * 打开指定网址 * * @access public * @param string $url 地址 * @param string $requestType 请求类型 * @return string */ function OpenUrl($url,$requestType="GET") { $this->ResetAny(); $this->JumpCount = 0; $this->m_httphead = Array() ; $this->m_html = ''; $this->reTry = 0; $this->Close(); //初始化系统 $this->PrivateInit($url); $this->PrivateStartSession($requestType); } /** * 转到303重定向网址 * * @access public * @param string $url 地址 * @return string */ function JumpOpenUrl($url) { $this->ResetAny(); $this->JumpCount++; $this->m_httphead = Array() ; $this->m_html = ""; $this->Close(); //初始化系统 $this->PrivateInit($url); $this->PrivateStartSession('GET'); } /** * 获得某操作错误的原因 * * @access public * @return void */ function printError() { echo "错误信息:".$this->m_error; echo "<br/>具体返回头:<br/>"; foreach($this->m_httphead as $k=>$v){ echo "$k => $v <br/>\r\n"; } } /** * 判别用Get方法发送的头的应答结果是否正确 * * @access public * @return bool */ function IsGetOK() { if( preg_match("/^2/",$this->GetHead("http-state")) ) { return TRUE; } else { $this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."<br/>"; return FALSE; } } /** * 看看返回的网页是否是text类型 * * @access public * @return bool */ function IsText() { if( preg_match("/^2/",$this->GetHead("http-state")) && preg_match("/text|xml/i",$this->GetHead("content-type")) ) { return TRUE; } else { $this->m_error .= "内容为非文本类型或网址重定向<br/>"; return FALSE; } } /** * 判断返回的网页是否是特定的类型 * * @access public * @param string $ctype 内容类型 * @return string */ function IsContentType($ctype) { if(preg_match("/^2/",$this->GetHead("http-state")) && $this->GetHead("content-type")==strtolower($ctype)) { return TRUE; } else { $this->m_error .= "类型不对 ".$this->GetHead("content-type")."<br/>"; return FALSE; } } /** * 用Http协议下载文件 * * @access public * @param string $savefilename 保存文件名称 * @return string */ function SaveToBin($savefilename) { if(!$this->IsGetOK()) { return FALSE; } if(@feof($this->m_fp)) { $this->m_error = "连接已经关闭!"; return FALSE; } $fp = fopen($savefilename,"w"); while(!feof($this->m_fp)) { fwrite($fp, fread($this->m_fp, 1024)); } fclose($this->m_fp); fclose($fp); return TRUE; } /** * 保存网页内容为Text文件 * * @access public * @param string $savefilename 保存文件名称 * @return string */ function SaveToText($savefilename) { if($this->IsText()) { $this->SaveBinFile($savefilename); } else { return ""; } } /** * 用Http协议获得一个网页的内容 * * @access public * @return string */ function GetHtml() { if(!$this->IsText()) { return ''; } if($this->m_html!='') { return $this->m_html; } if(!$this->m_fp||@feof($this->m_fp)) { return ''; } while(!feof($this->m_fp)) { $this->m_html .= fgets($this->m_fp,256); } @fclose($this->m_fp); return $this->m_html; } /** * 开始HTTP会话 * * @access public * @param string $requestType 请求类型 * @return string */ function PrivateStartSession($requestType="GET") { if(!$this->PrivateOpenHost()) { $this->m_error .= "打开远程主机出错!"; return FALSE; } $this->reTry++; if($this->GetHead("http-edition")=="HTTP/1.1") { $httpv = "HTTP/1.1"; } else { $httpv = "HTTP/1.0"; } $ps = explode('?',$this->m_urlpath); $headString = ''; //发送固定的起始请求头GET、Host信息 if($requestType=="GET") { $headString .= "GET ".$this->m_urlpath." $httpv\r\n"; } else { $headString .= "POST ".$ps[0]." $httpv\r\n"; } $this->m_puthead["Host"] = $this->m_host; //发送用户自定义的请求头 if(!isset($this->m_puthead["Accept"])) { $this->m_puthead["Accept"] = "*/*"; } if(!isset($this->m_puthead["User-Agent"])) { $this->m_puthead["User-Agent"] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2)"; } if(!isset($this->m_puthead["Refer"])) { $this->m_puthead["Refer"] = "http://".$this->m_puthead["Host"]; } foreach($this->m_puthead as $k=>$v) { $k = trim($k); $v = trim($v); if($k!=""&&$v!="") { $headString .= "$k: $v\r\n"; } } fputs($this->m_fp, $headString); if($requestType=="POST") { $postdata = ""; if(count($ps)>1) { for($i=1;$i<count($ps);$i++) { $postdata .= $ps[$i]; } } else { $postdata = "OK"; } $plen = strlen($postdata); fputs($this->m_fp,"Content-Type: application/x-www-form-urlencoded\r\n"); fputs($this->m_fp,"Content-Length: $plen\r\n"); } //发送固定的结束请求头 //HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束 if($httpv=="HTTP/1.1") { fputs($this->m_fp,"Connection: Close\r\n\r\n"); } else { fputs($this->m_fp,"\r\n"); } if($requestType=="POST") { fputs($this->m_fp,$postdata); } //获取应答头状态信息 $httpstas = explode(" ",fgets($this->m_fp,256)); $this->m_httphead["http-edition"] = trim($httpstas[0]); $this->m_httphead["http-state"] = trim($httpstas[1]); $this->m_httphead["http-describe"] = ""; for($i=2;$i<count($httpstas);$i++) { $this->m_httphead["http-describe"] .= " ".trim($httpstas[$i]); } //获取详细应答头 while(!feof($this->m_fp)) { $line = trim(fgets($this->m_fp,256)); if($line == "") { break; } $hkey = ""; $hvalue = ""; $v = 0; for($i=0;$i<strlen($line);$i++) { if($v==1) { $hvalue .= $line[$i]; } if($line[$i]==":") { $v = 1; } if($v==0) { $hkey .= $line[$i]; } } $hkey = trim($hkey); if($hkey!="") { $this->m_httphead[strtolower($hkey)] = trim($hvalue); } } //如果连接被不正常关闭,重试 if(feof($this->m_fp)) { if($this->reTry > 10) { return FALSE; } $this->PrivateStartSession($requestType); } //判断是否是3xx开头的应答 if(preg_match("/^3/",$this->m_httphead["http-state"])) { if($this->JumpCount > 3) { return; } if(isset($this->m_httphead["location"])) { $newurl = $this->m_httphead["location"]; if(preg_match("/^http/i",$newurl)) { $this->JumpOpenUrl($newurl); } else { $newurl = $this->FillUrl($newurl); $this->JumpOpenUrl($newurl); } } else { $this->m_error = "无法识别的答复!"; } } } /** * 获得一个Http头的值 * * @access public * @param string $headname 头文件名称 * @return string */ function GetHead($headname) { $headname = strtolower($headname); return isset($this->m_httphead[$headname]) ? $this->m_httphead[$headname] : ''; } /** * 设置Http头的值 * * @access public * @param string $skey 键 * @param string $svalue 值 * @return string */ function SetHead($skey,$svalue) { $this->m_puthead[$skey] = $svalue; } /** * 打开连接 * * @access public * @return bool */ function PrivateOpenHost() { if($this->m_host=="") { return FALSE; } $errno = ""; $errstr = ""; $this->m_fp = @fsockopen($this->m_host, $this->m_port, $errno, $errstr,10); if(!$this->m_fp) { $this->m_error = $errstr; return FALSE; } else { return TRUE; } } /** * 关闭连接 * * @access public * @return void */ function Close() { @fclose($this->m_fp); } /** * 补全相对网址 * * @access public * @param string $surl 需要不全的地址 * @return string */ function FillUrl($surl) { $i = 0; $dstr = ""; $pstr = ""; $okurl = ""; $pathStep = 0; $surl = trim($surl); if($surl=="") { return ""; } $pos = strpos($surl,"#"); if($pos>0) { $surl = substr($surl,0,$pos); } if($surl[0]=="/") { $okurl = "http://".$this->HomeUrl.$surl; } else if($surl[0]==".") { if(strlen($surl)<=1) { return ""; } else if($surl[1]=="/") { $okurl = "http://".$this->BaseUrlPath."/".substr($surl,2,strlen($surl)-2); } else { $urls = explode("/",$surl); foreach($urls as $u) { if($u=="..") { $pathStep++; } else if($i<count($urls)-1) { $dstr .= $urls[$i]."/"; } else { $dstr .= $urls[$i]; } $i++; } $urls = explode("/",$this->BaseUrlPath); if(count($urls) <= $pathStep) { return ""; } else { $pstr = "http://"; for($i=0;$i<count($urls)-$pathStep;$i++) { $pstr .= $urls[$i]."/"; } $okurl = $pstr.$dstr; } } } else { if(strlen($surl)<7) { $okurl = "http://".$this->BaseUrlPath."/".$surl; } else if(strtolower(substr($surl,0,7))=="http://") { $okurl = $surl; } else { $okurl = "http://".$this->BaseUrlPath."/".$surl; } } $okurl = preg_replace("/^(http:\/\/)/i","",$okurl); $okurl = preg_replace("/\/{1,}/", "/", $okurl); return "http://".$okurl; } }//End Class
希望本文所述对大家的php程序设计有所帮助。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Notepad++7.3.1
Easy-to-use and free code editor