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为什么小弟我的http_build_url()函数会报错

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Release: 2016-06-13 13:17:49
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为什么我的http_build_url()函数会报错
echo http_build_url("http://user@www.example.com/pub/index.php?a=b#files",
  array(
  "scheme" => "ftp",
  "host" => "ftp.example.com",
  "path" => "files/current/",
  "query" => "a=c"
  ),
  HTTP_URL_STRIP_AUTH | HTTP_URL_JOIN_PATH | HTTP_URL_JOIN_QUERY | HTTP_URL_STRIP_FRAGMENT
);
?> 
手册中写的是无需任何配置,直接使用即可,为什么我的会报错Fatal error: Call to undefined function http_build_url() in E:\wamp\www\sometimeExa\bulid_url.php on line 2

------解决方案--------------------
(PECL pecl_http >= 0.21.0)
------解决方案--------------------
http_build_url
(PECL pecl_http:0.21.0-1.5.5)

------解决方案--------------------
http://pecl.php.net/ *nix

http://downloads.php.net/pierre/ windows
------解决方案--------------------
http_build_url 函数隶属于 pecl_http 扩展
PECL 系列的扩展,不属于 php 的标准配置系列,不由 php 开发组织维护
如无特殊需要,尽可能的不使用 PECL 扩展。如果使用了,则需密切关注开发者的网站,以便及时更新和消除 BUG

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