PHP: rfc:new-curl-error-functions

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====== PHP RFC: Add curl_multi_errno(), curl_share_errno() and curl_share_strerror() ======
  * Version: 0.9
  * Date: 2016-04-29
  * Author: Pierrick Charron <pierrick@php.net>
  * Status: Implemented (PHP 7.1)
  * First Published at: https://wiki.php.net/rfc/new-curl-error-functions

===== Introduction =====

The ext/curl extension define 3 different resource types :

  * cURL handle created by php curl_init()
  * cURL Multi Handle created by curl_multi_init()
  * cURL Share Handle created by curl_share_init()

As of today, it's possible to get the last error related to a cURL handle with the curl_errno() function, but there is no way to retrieve what was the last error related to a cURL Multi/Share handle.

===== Proposal =====

Add curl_multi_errno(), curl_share_errno() and curl_share_strerror() functions to get a consistent mechanism of error retrieval across all curl resource types.

^ Resource type     ^ init function     ^ last error         ^ error message         ^
| cURL handle       | curl_init()       | curl_errno()       | curl_strerror()       |
| cURL Multi Handle | curl_multi_init() | **curl_multi_errno()** | curl_multi_strerror() |
| cURL Share Handle | curl_share_init() | **curl_share_errno()** | **curl_share_strerror()** |
Functions in bold are the one that do not exists and that are be introduced in this RFC.

===== Functions signature ====

<code php>
int curl_multi_errno(resource $mh);
int curl_share_errno(resource $rh);
string curl_share_strerror(int $errno);
</code>

===== Backward Incompatible Changes =====

None.

===== Proposed PHP Version(s) =====

7.1

===== Vote =====

Simple 50% +1 majority: “Should those functions be added in 7.1”. The voting began on Jun 9 and will close on Jun 23.

<doodle title="Should those functions should be added in 7.1" auth="pierrick" voteType="single" closed="true">
   * Yes
   * No
</doodle>

===== Patches and Tests =====

Patch : [[https://github.com/php/php-src/pull/1896]]

===== Implementation =====

Merged into php-src for PHP 7.1: https://github.com/php/php-src/commit/3d71c1de7af6f41653addb7bb75dd37adc4e87b0
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