Q:

PHP - Errors with get_headers and SSL

This is my code
$url = 'http://www.wikipedia.com';  // URL WITH HTTP
$hurl = str_replace("http", "https", $url); // URL WITH HTTPS

$urlheads = get_headers($url, 1);   
$surlheads = get_headers($hurl, 1);     
$urlx = false;
$surlx = false;

foreach ($urlheads as $name => $value) 
{
    if ($name === 'Location') 
    {
        $urlx=$value;   
    }
    else{

    }
}
print_r($urlx);

And this is error I'm getting:
Warning: get_headers(): Peer certificate CN=`*.wikipedia.org' did not match expected CN=`www.wikipedia.com' in....

Warning: get_headers(): Failed to enable crypto in....

Warning: get_headers(https://www.wikipedia.com): failed to open stream:     operation failed in .....
Array ( [0] => http://www.wikipedia.org/ [1] => https://www.wikipedia.org/ )

Why is this happening and what is proper way to get headers from https page without errors (without curl). Also, when I try on some other https site everything is ok

A:

The issue is down to the server certificate being presented as a wildcard * so it can allow all sub-domains under the same certificate, but for some strange reason the wildcard * is used literally during the SSL verify leading to failure. To get around this, use stream_context_set_default() to set the SSL verification as false. 
stream_context_set_default( [
    'ssl' => [
        'verify_peer' => false,
        'verify_peer_name' => false,
    ],
]);

$url = 'https://www.wikipedia.com';  // URL WITH HTTPS

$headers = get_headers($url, 1);

var_dump($headers);

Output
array(25) {
    [0] => string(30)
    "HTTP/1.1 301 Moved Permanently" ["Date"] => array(2) {
        [0] => string(29)
        "Sun, 27 Nov 2016 15:44:44 GMT" [1] => string(29)
        "Sun, 27 Nov 2016 15:44:44 GMT"
    }["Content-Type"] => array(2) {
        [0] => string(29)
        "text/html; charset=iso-8859-1" [1] => string(9)
        "text/html"
    }["Content-Length"] => array(2) {
        [0] => string(3)
        "234" [1] => string(5)
        "80740"
    }["Connection"] => array(2) {
        [0] => string(5)
        "close" [1] => string(5)
        "close"
    }["Server"] => array(2) {
        [0] => string(18)
        "mw1174.eqiad.wmnet" [1] => string(18)
        "mw1175.eqiad.wmnet"
    }["X-Powered-By"] => array(2) {
        [0] => string(17)
        "HHVM/3.3.0-static" [1] => string(17)
        "HHVM/3.3.0-static"
    }["Location"] => string(26)
    "https://www.wikipedia.org/" ["Cache-Control"] => array(2) {
        [0] => string(15)
        "max-age=2592000" [1] => string(45)
        "s-maxage=86400, must-revalidate, max-age=3600"
    }["Expires"] => string(29)
    "Wed, 21 Dec 2016 14:55:26 GMT" ["Vary"] => array(2) {
        [0] => string(34)
        "X-Forwarded-Proto, Accept-Encoding" [1] => string(15)
        "Accept-Encoding"
    }["X-Varnish"] => array(2) {
        [0] => string(60)
        "252832401 234761536, 189834925 105479673, 503055844 58285403" [1] => string(57)
        "815608054 810788132, 143499750 28230570, 504104889 557059"
    }["Via"] => array(2) {
        [0] => string(46)
        "1.1 varnish-v4, 1.1 varnish-v4, 1.1 varnish-v4" [1] => string(46)
        "1.1 varnish-v4, 1.1 varnish-v4, 1.1 varnish-v4"
    }["Age"] => array(2) {
        [0] => string(6)
        "521357" [1] => string(5)
        "59119"
    }["X-Cache"] => array(2) {
        [0] => string(41)
        "cp1053 hit/4, cp3032 hit/9, cp3030 hit/17" [1] => string(46)
        "cp1054 hit/8, cp3032 hit/33, cp3030 hit/531848"
    }["X-Cache-Status"] => array(2) {
        [0] => string(3)
        "hit" [1] => string(3)
        "hit"
    }["Set-Cookie"] => array(4) {
        [0] => string(88)
        "WMF-Last-Access=27-Nov-2016;Path=/;HttpOnly;secure;Expires=Thu, 29 Dec 2016 12:00:00 GMT" [1] => string(76)
        "GeoIP=GB:WLS:Ammanford:51.79:-3.99:v4; Path=/; secure; Domain=.wikipedia.com" [2] => string(88)
        "WMF-Last-Access=27-Nov-2016;Path=/;HttpOnly;secure;Expires=Thu, 29 Dec 2016 12:00:00 GMT" [3] => string(76)
        "GeoIP=GB:WLS:Ammanford:51.79:-3.99:v4; Path=/; secure; Domain=.wikipedia.org"
    }["X-Analytics"] => array(2) {
        [0] => string(19)
        "https=1;nocookies=1" [1] => string(19)
        "https=1;nocookies=1"
    }["X-Client-IP"] => array(2) {
        [0] => string(13)
        "81.129.193.46" [1] => string(13)
        "81.129.193.46"
    }[1] => string(15)
    "HTTP/1.1 200 OK" ["ETag"] => string(23)
    "W/"
    13 b64 - 541e8 ad5dab71 "" ["Last-Modified"] => string(29)
    "Tue, 22 Nov 2016 19:21:20 GMT" ["Backend-Timing"] => string(24)
    "D=213 t=1479943165198824" ["Strict-Transport-Security"] => string(44)
    "max-age=31536000; includeSubDomains; preload" ["Accept-Ranges"] => string(5)
    "bytes"
}

