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.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

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