Description:
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When fetching things from an https:// url with PHP (e.g. file_get_contents()), the hostname is matched against the names in the certificate's subject alternative names extension since PHP 5.6, good. However, it does not apply the wildcard matching that it does to common names to these names, therefore https requests to resources on a server that has a wildcard SAN fail.

An example site that has such a certificate is https://raw.githubusercontent.com.

The test script below reproduces the problem for me.

Test script:
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<?php

ini_set("display_errors", TRUE);

$readme = file_get_contents('https://raw.githubusercontent.com/php/php-src/master/README.md');

echo $readme;


Expected result:
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Contents of README.md.

Actual result:
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Warning: file_get_contents(): Peer certificate CN=`www.github.com' did not match expected CN=`raw.githubusercontent.com' in /srv/www/test.php on line 6

Warning: file_get_contents(): Failed to enable crypto in /srv/www/test.php on line 6

Warning: file_get_contents(https://raw.githubusercontent.com/php/php-src/master/README.md): failed to open stream: operation failed in /srv/www/test.php on line 6