PHP 获取远程文件内容
如下函数：
<?
/**
获取远程文件内容
@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'); //引用垃圾邮件检查
$file_content = curl_exec($curl_handle);
curl_close($curl_handle);
} else {
$file_content = '';
}
return $file_content;
}
?>
相关解释：
1
,ini_get : Returns the value of the configuration option as a string on success,
or
an empty string on failure(读取 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(配置文件中的内容)
3
,fopen(
"
rb
"
): 在操作二进制文件时如果没有指定
'
b
'
标记，可能会碰到一些奇怪的问题，包括坏掉的图片文件以及关于 \r\n 字符的奇怪问题。
注意: 为移植性考虑，强烈建议在用 fopen() 打开文件时总是使用
'
b
'
标记。
注意: 再一次，为移植性考虑，强烈建议你重写那些依赖于
'
t
'
模式的代码使其使用正确的行结束符并改成
'
b
'
模式。
4
,strtolower
--
Make a string lowercase
5
,curl_init() :curl_init
--
Initialize a cURL session(初始化一个cUrl会话)
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(提供设置)
bool curl_setopt ( resource ch, int option, mixed value )
Sets an option on the given cURL session handle. (具体请看 PHP 手册) 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.(无限期等待 设置为 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.
如果成功则返回 TRUE，失败则返回 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