获取常量名作为字符串 [英] Get a constant name as a string

问题描述

我为cURL写了一个包装类，当你设置一个选项时，将选项名称保存到数组中，以便我可以管理设置哪些选项。

<问题是，cURL选项名称是常量，它们实际上是整数，所以我不能真正告诉哪些选项已经设置。

从类中节选：

  class Curl {
 
 protected $ _options; 
 
 public function setOption（$ name，$ value）{
 $ result = curl_setopt（$ this-> _handle，$ name，$ value）; 
 if（$ result）{
 $ this-> _options [$ name] = $ value; 
} 
 return $ result; 
} 
 
} 
  

假设我设置了以下选项：

  array（
 CURLOPT_CONNECTTIMEOUT => 10，
 CURLOPT_HEADER => 0，
 CURLOPT_POST => 1，
 CURLOPT_RETURNTRANSFER => 1，
 CURLOPT_TIMEOUT => 30 
）
  

Curl :: _ options 将如下所示：

  array（
（int）78 =>（int）10，
（int）42 =>（int）0，
 >（int）1，
（int）19913 =>（int）1，
（int）13 =>（int）30 
）
 c $ c> 

如何获取cURL常量的实际名称？这是否可以使用反射类？

解决方案

嗯，技术上有一个方法来准备一个数组 curl 常量名称作为字符串及其值as，well，values：

  $ curl_constants = get_defined_constants（true）['curl']; 
  

您似乎只处理 CURLOPT 常数，您可以细化：

  $ curlopt_constants = []; 
 foreach（$ curl_constants as $ constant_name => $ constant_value）{
 if（strpos（$ constant_name，'CURLOPT'）=== 0）{
 $ curlopt_constants [$ constant_name] = $ constant_value;问题是，这些数组中的几个常量仍然有一个常量相同的值（ CURLOPT_SSLCERTPASSWD ， CURLOPT_SSLKEYPASSWD 和 CURLOPT_KEYPASSWD  =>  10026 ;  CURLOPT_READDATA 和 CURLOPT_INFILE  =>  10009 ）。如果你确定这个歧义，你可以翻转这个数组，把它变成一个哈希。
  $ curlopt_constants_hash = array_flip $ curlopt_constants）; 
  
然后你可以通过查找这个哈希来获得字符串文字：
  $ curlopt_constant_name = 
 isset（$ curlopt_constants_hash [$ constant_value]）
？ $ curlopt_constants_hash [$ constant_value] 
：null 
; 
  
（检查散列）比使用 array_search 。
 
I'm writing a wrapper class for cURL which, when you set an option, saves the option name to an array so that I can manage which options are set.

The problem is that with cURL option names being constants, they are actually integers so I can't really tell which options have been set.

Excerpt from the class:
class Curl {

    protected $_options;

    public function setOption($name, $value) {
        $result = curl_setopt($this->_handle, $name, $value);
        if ($result) {
            $this->_options[$name] = $value;
        }
        return $result;
    }

}
Let's say I set the following options:
array(
    CURLOPT_CONNECTTIMEOUT => 10,
    CURLOPT_HEADER => 0,
    CURLOPT_POST => 1,
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_TIMEOUT => 30
)
The Curl::_options will then look like:
array(
    (int) 78 => (int) 10,
    (int) 42 => (int) 0,
    (int) 47 => (int) 1,
    (int) 19913 => (int) 1,
    (int) 13 => (int) 30
)
How can I get the actual names of the cURL constants?  Is this possible using the Reflection class?
解决方案
Well, technically there's a way to prepare an array with curl constant names as strings and their values as, well, values:
$curl_constants = get_defined_constants(true)['curl'];
As you seem to deal only with CURLOPT constants, you can refine it:
$curlopt_constants = [];
foreach ($curl_constants as $constant_name => $constant_value) {
  if (strpos($constant_name, 'CURLOPT') === 0) {
    $curlopt_constants[$constant_name] = $constant_value;
  }
}
The problem is, several constants in these array still have the same value (CURLOPT_SSLCERTPASSWD, CURLOPT_SSLKEYPASSWD and CURLOPT_KEYPASSWD => 10026; CURLOPT_READDATA and CURLOPT_INFILE => 10009). If you're OK with this ambiguity, you can flip this array, turning it into a hash.
$curlopt_constants_hash = array_flip($curlopt_constants);
Then you can get the string literal just by looking in this hash:
$curlopt_constant_name = 
    isset($curlopt_constants_hash[$constant_value])
        ? $curlopt_constants_hash[$constant_value]
        : null
;
That (checking hash) is faster than using array_search on the array.

                        
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