PHP 獲取遠(yuǎn)程文件內(nèi)容的函數(shù)代碼

更新時(shí)間：2010年03月24日 19:38:03 作者：

PHP 獲取遠(yuǎn)程文件內(nèi)容的代碼，后面有一些注釋可以參考下，其實(shí)大家可以參考腳本之家發(fā)布的一些采集程序代碼。

如下函數(shù)：

 
<? 
/** 
獲取遠(yuǎn)程文件內(nèi)容 
@param $url 文件http地址 
*/ 
function fopen_url($url) 
{ 
if (function_exists('file_get_contents')) { 
$file_content = @file_get_contents($url); 
} elseif (ini_get('allow_url_fopen') && ($file = @fopen($url, 'rb'))){ 
$i = 0; 
while (!feof($file) && $i++ < 1000) { 
$file_content .= strtolower(fread($file, 4096)); 
} 
fclose($file); 
} elseif (function_exists('curl_init')) { 
$curl_handle = curl_init(); 
curl_setopt($curl_handle, CURLOPT_URL, $url); 
curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT,2); 
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER,1); 
curl_setopt($curl_handle, CURLOPT_FAILONERROR,1); 
curl_setopt($curl_handle, CURLOPT_USERAGENT, 'Trackback Spam Check'); //引用垃圾郵件檢查 
$file_content = curl_exec($curl_handle); 
curl_close($curl_handle); 
} else { 
$file_content = ''; 
} 
return $file_content; 
} 
?> 

相關(guān)解釋：
1,ini_get : Returns the value of the configuration option as a string on success, or an empty string on failure(讀取 php.ini 配置文件中的值)
2,; Whether to allow the treatment of URLs (like http:// or ftp://) as files.
allow_url_fopen = On(配置文件中的內(nèi)容)
3,fopen( "rb"): 在操作二進(jìn)制文件時(shí)如果沒(méi)有指定 'b' 標(biāo)記，可能會(huì)碰到一些奇怪的問(wèn)題，包括壞掉的圖片文件以及關(guān)于 \r\n 字符的奇怪問(wèn)題。
注意: 為移植性考慮，強(qiáng)烈建議在用 fopen() 打開(kāi)文件時(shí)總是使用 'b' 標(biāo)記。
注意: 再一次，為移植性考慮，強(qiáng)烈建議你重寫那些依賴于 't' 模式的代碼使其使用正確的行結(jié)束符并改成 'b' 模式。
4,strtolower -- Make a string lowercase
5,curl_init() :curl_init -- Initialize a cURL session(初始化一個(gè)cUrl會(huì)話)
resource curl_init ( [string url] )
Initializes a new session and return a cURL handle for use with the curl_setopt(), curl_exec(), and curl_close() functions.
url--If provided, the CURLOPT_URL option will be set to its value. You can manually set this using the curl_setopt() function.
Returns a cURL handle on success, FALSE on errors.
6,curl_setopt -- Set an option for a cURL transfer(提供設(shè)置)
bool curl_setopt ( resource ch, int option, mixed value )
Sets an option on the given cURL session handle. (具體請(qǐng)看 PHP 手冊(cè)) There:
CURLOPT_URL ：The URL to fetch. You can also set this when initializing a session with curl_init().
CURLOPT_CONNECTTIMEOUT ：The number of seconds to wait whilst trying to connect. Use 0 to wait indefinitely.(無(wú)限期等待設(shè)置為 0)
CURLOPT_RETURNTRANSFER ：TRUE to return the transfer as a string of the return value of curl_exec() instead of outputting it out directly.
CURLOPT_FAILONERROR ：TRUE to fail silently if the HTTP code returned is greater than or equal to 400. The default behavior is to return the page normally, ignoring the code.
CURLOPT_USERAGENT ：The contents of the "User-Agent: " header to be used in a HTTP request.
7,curl_exec : Perform a cURL session, This function should be called after you initialize a cURL session and all the options for the session are set.
如果成功則返回 TRUE，失敗則返回 FALSE。 However, if the CURLOPT_RETURNTRANSFER option is set, it will return the result on success, FALSE on failure
8,curl_close -- Close a cURL session

下面是一些參考代碼:
PHP 采集程序常用函數(shù)
PHP 采集獲取指定網(wǎng)址的內(nèi)容

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