解决PHP5.6的cURL扩展开启失败的问题

问题描述

打开php.ini，找到

;extension=php_curl.dll

去掉注释保存后，重启Apache，访问http://localhost/test.php。test.php代码如下

 

// create curl resource
$ch = curl_init();

// set url 
curl_setopt($ch, CURLOPT_URL, "http://www.kevinbai.com");

// return the transfer as a string
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

// $output contains the output string
$output = curl_exec($ch);

// close curl resource to free up system resources
curl_close($ch);

echo $output;

然而还是报错

Call to undefined function curl_init()

注意：在此之前查看phpinfo，有如下内容
Loaded Configuration File D:\PHPEnvironment\php-5.6.24\php.ini
所以已保证配置加载成功

解决方案

找了很多文章，最后在官网上http://php.net/manual/en/curl.examples.php看到相关描述

I had to also also copy libssh2.dll into my Apache24 folder for this
to work with my PHP 5.6.2 installation. So altogether I had to do the
following:

Move to Windows\system32 folder:
libssh2.dll, php_curl.dll, ssleay32.dll, libeay32.dll

Move to Apache24\bin folder
libssh2.dll
Uncomment extension=php_curl.dll

我将php安装目录下的libssh2.dll复制到apache的bin目录，并重新启动Apache，于是cURL成功开启。

注意：我的刚开始已经完成上述步骤，但是是在windows命令行工具下用的httpd -k restart重启的Apache，结果仍然报Call to undefined function curl_init()的错误。之后无意中在windows服务窗口中右键Apache服务，重启后成功。

测试环境

httpd-2.4.23-x64-vc11
php-5.6.24-Win32-VC11-x64
mysql-5.7.14-winx64