curl_version
(PHP 4 >= 4.0.2, PHP 5, PHP 7)
curl_version — 获取cURL版本信息
说明
$age = CURLVERSION_NOW
] )返回关于cURL的版本信息。
参数
-
age -
返回值
返回一个相关的数组包含如下元素：
| Indice | 值描述 |
|---|---|
| version_number | cURL 24位版本号 |
| version | cURL 版本号，字符串形式 |
| ssl_version_number | OpenSSL 24 位版本号 |
| ssl_version | OpenSSL 版本号，字符串形式 |
| libz_version | zlib 版本号，字符串形式 |
| host | 关于编译cURL主机的信息 |
| age | |
| features | 一个CURL_VERSION_XXX常量的位掩码 |
| protocols | 一个cURL支持的协议名字的数组 |
范例
Example #1 curl_version() example
这个范例将会检查当前cURL版本使用 curl_version() 返回的'features'位掩码中哪些特性是可用的。
<?php
// 获取cURL版本数组
$version = curl_version ();
// 在cURL编译版本中使用位域来检查某些特性
$bitfields = Array(
'CURL_VERSION_IPV6' ,
'CURL_VERSION_KERBEROS4' ,
'CURL_VERSION_SSL' ,
'CURL_VERSION_LIBZ'
);
foreach( $bitfields as $feature )
{
echo $feature . ( $version [ 'features' ] & constant ( $feature ) ? ' matches' : ' does not match' );
echo PHP_EOL ;
}
?> 用户评论:
[#1] nimasdj [AT] yahoo [DOT] com [2015-07-30 10:04:48]
If you want to check if your curl supports ssl, it is not good idea to go with curl_version()['ssl_version'],
e.g.
<?php
if (stripos(curl_version()['ssl_version'], "openssl") !== false) {
?>
as curl says here http://curl.haxx.se/docs/faq.html#Does_curl_work_build_with_other it may use other ssl library than OpenSSL (which does not have anything to do with that separated openssl extension, curl has its own openssl library) so as described here http://curl.haxx.se/libcurl/c/curl_version_info.html it is better to go with CURL_VERSION_SSL bitmask check rather than curl_version()['ssl_version']. Note that not all of those constants stated on official cURL website are available in php, but only these four constants:
[CURL_VERSION_IPV6] => 1
[CURL_VERSION_KERBEROS4] => 2
[CURL_VERSION_SSL] => 4
[CURL_VERSION_LIBZ] => 8
I tested this on Windows by disabling "openssl" extension in php.ini and noticed curl has nothing to do with that separated openssl extension but it has its own openssl, in other word, disabling openssl extension does not affect on curl_version()['ssl_version']. So if you want to check if curl has support for ssl, you should not rely on existence of that separated openssl extension and above I explained you should not rely on curl_version()['ssl_version'] neither. The only reliable way is CURL_VERSION_SSL bitmask checking:
<?php
if (!curl_version()['features'] & CURL_VERSION_SSL) {
echo "SSL is not supported with this cURL installation.";
}
?>