PHP –with-curlwrappers 导致的问题

有如下代码： $opts = array( 'http' = array( 'method' = "GET", 'header' = "Accept-language: en\r\n" . "Cookie: foo=bar\r\n" . "User-Agent: MyAgent/1.0\r\n" ));$context = stream_context_create($opts);$result = file_get_contents('http://www.e

有如下代码：

$opts = array(
  'http' => array(
    'method' => "GET",
    'header' => "Accept-language: en\r\n" . 
                "Cookie: foo=bar\r\n" . 
                "User-Agent: MyAgent/1.0\r\n"
  )
);
$context = stream_context_create($opts);
$result = file_get_contents('http://www.example.com/', false, $context);
var_dump($result);

正常情况下以上应该输出www.example.com返回的内容，但是实际上得到的结果是空字符串，遂进行如下测试：

$file = fopen('http://www.example.com/', 'rb');
var_dump(stream_get_meta_data($file));
/*
输出结果：
array(10) {
  ["wrapper_data"]=>
  array(2) {
    ["headers"]=>
    array(0) {
    }
    ["readbuf"]=>
    resource(38) of type (stream)
  }
  ["wrapper_type"]=>
  string(4) "cURL"
  ["stream_type"]=>
  string(4) "cURL"
  ["mode"]=>
  string(2) "rb"
  ["unread_bytes"]=>
  int(0)
  ["seekable"]=>
  bool(false)
  ["uri"]=>
  string(23) "http://www.example.com/"
  ["timed_out"]=>
  bool(false)
  ["blocked"]=>
  bool(true)
  ["eof"]=>
  bool(false)
}*/

输出的结果中，wrapper_type为cURL，而且wrapper_data为空，这是不正常的，正常情况下wrapper_type应为http，wrapper_data数组中应该包含响应头信息。google之，发现这个现象与--with-curlwrappers这个编译选项有关，遂查看PHP编译参数：

$ php -i | grep configure
Configure Command =>  './configure' '--prefix=/usr/local/php' '--with-config-file-path=/usr/local/php/etc' '--with-mysql=/usr/local/mysql' '--with-mysqli=/usr/local/mysql/bin/mysql_config' '--with-iconv-dir=/usr/local' '--with-zlib' '--with-libxml-dir=/usr' '--enable-xml' '--enable-bcmath' '--enable-shmop' '--enable-sysvsem' '--enable-inline-optimization' '--with-curl' '--with-curlwrappers' '--enable-mbregex' '--enable-fpm' '--enable-mbstring' '--with-mcrypt' '--with-openssl' '--with-mhash' '--enable-pcntl' '--enable-sockets' '--with-xmlrpc' '--enable-zip' '--enable-soap' '--enable-bcmath'

--with-curlwrappers被启用了，问题应该出在这里，查看一下这个编译选项的用处：

$ ./configure --help | grep curlwrappers
  --with-curlwrappers     EXPERIMENTAL: Use cURL for url streams

看来--with-curlwrappers这个编译选项是用来处理url stream的，不过前面有个硕大的EXPERIMENTAL字样，还在试验中。 现有的解决方法是重新编译PHP，去掉「--with-curlwrappers」：

$ cd /path/to/php-5.3.6
$ make clean
$ ./configure --prefix=/usr/local/php --with-config-file-path=/usr/local/php/etc --with-mysql=/usr/local/mysql \
--with-mysqli=/usr/local/mysql/bin/mysql_config --with-iconv-dir=/usr/local --with-zlib \
--with-libxml-dir=/usr --enable-xml --enable-bcmath --enable-shmop --enable-sysvsem \
--enable-inline-optimization --with-curl --enable-mbregex --enable-fpm  --enable-mbstring --with-mcrypt \
--with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip \
--enable-soap --enable-bcmath -with-gd --with-jpeg-dir=/usr --with-png-dir=/usr --enable-gd-native-ttf
$ make && make install
$ cd /usr/local/php/bin
# 删除旧的PHP binary文件，并用新的进行替换，Mac下重新编译后会产生php.dSYM文件，其他Linux系统请自行处理
$ rm php && mv php.dSYM php 

完成后，再做个测试：

$file = fopen('http://www.example.com/', 'rb');
var_dump(stream_get_meta_data($file));
/*
结果如下：
array(10) {
  ["wrapper_data"]=>
  array(12) {
    [0]=>
    string(18) "HTTP/1.0 302 Found"
    [1]=>
    string(46) "Location: http://www.iana.org/domains/example/"
    [2]=>
    string(13) "Server: BigIP"
    [3]=>
    string(17) "Connection: close"
    [4]=>
    string(17) "Content-Length: 0"
    [5]=>
    string(15) "HTTP/1.1 200 OK"
    [6]=>
    string(35) "Date: Sun, 18 Mar 2012 06:12:27 GMT"
    [7]=>
    string(29) "Server: Apache/2.2.3 (CentOS)"
    [8]=>
    string(44) "Last-Modified: Wed, 09 Feb 2011 17:13:15 GMT"
    [9]=>
    string(21) "Vary: Accept-Encoding"
    [10]=>
    string(17) "Connection: close"
    [11]=>
    string(38) "Content-Type: text/html; charset=UTF-8"
  }
  ["wrapper_type"]=>
  string(4) "http"
  ["stream_type"]=>
  string(14) "tcp_socket/ssl"
  ["mode"]=>
  string(2) "rb"
  ["unread_bytes"]=>
  int(1225)
  ["seekable"]=>
  bool(false)
  ["uri"]=>
  string(23) "http://www.example.com/"
  ["timed_out"]=>
  bool(false)
  ["blocked"]=>
  bool(true)
  ["eof"]=>
  bool(false)
}
*/

wrapper_type变成了http，wrapper_data也被填充了，一切恢复正常。所以一条结论：慎用--with-curlwrappers

参考：

http://cn.php.net/manual/en/function.stream-context-create.php#99353 https://www.facebook.com/note.php?note_id=290180466652

原文地址：PHP –with-curlwrappers 导致的问题, 感谢原作者分享。