blocks|key|591895|text|您要传递给$html_brand的确切内容是什么？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|591896|如果它有一个无效的URL语法，你很可能会得到HTTP代码0。|591897|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

What is the exact contents you are passing into $html_brand?

If it is has an invalid URL syntax, you will very likely get the HTTP code 0.

blocks|key|591937|text|在curl_exec之后尝试一下，看看问题出在哪里：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|591938|print+curl_error($ch);|code-block|syntax|javascript|591939|如果打印内容类似于“错误格式”，请检查您的URL格式。|591940|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try this after curl_exec to see what's the problem: 

<pre><code>print curl_error($ch);
</code></pre>

If it's print something like 'malformed' then check your URL format.

blocks|key|376189|text|如果你与服务器连接，你可以从它得到一个返回码，否则它会失败，你会得到一个0。因此，如果你尝试连接到"www.google.com/lksdfk“，你会得到一个400的返回码，如果你直接进入google.com，你会得到302+(如果你转到下一页，你会得到200……我这样做了，因为它转发到google.com.br，所以你可能得不到它)，如果你去"googlecom“，你会得到一个0(主机没有找到)，所以对于最后一个，没有人会发回代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|376190|使用以下代码进行了测试。|376191|<?php

$html_brand+=+"www.google.com";
$ch+=+curl_init();

$options+=+array(
++++CURLOPT_URL++++++++++++=>+$html_brand,
++++CURLOPT_RETURNTRANSFER+=>+true,
++++CURLOPT_HEADER+++++++++=>+true,
++++CURLOPT_FOLLOWLOCATION+=>+true,
++++CURLOPT_ENCODING+++++++=>+"",
++++CURLOPT_AUTOREFERER++++=>+true,
++++CURLOPT_CONNECTTIMEOUT+=>+120,
++++CURLOPT_TIMEOUT++++++++=>+120,
++++CURLOPT_MAXREDIRS++++++=>+10,
);
curl_setopt_array(+$ch,+$options+);
$response+=+curl_exec($ch);+
$httpCode+=+curl_getinfo($ch,+CURLINFO_HTTP_CODE);

if+(+$httpCode+!=+200+){
++++echo+"Return+code+is+{$httpCode}+\n"
++++++++.curl_error($ch);
}+else+{
++++echo+"<pre>".htmlspecialchars($response)."</pre>";
}

curl_close($ch);|code-block|syntax|javascript|376192|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you connect with the server, then you can get a return code from it, otherwise it will fail and you get a 0. So if you try to connect to "www.google.com/lksdfk" you will get a return code of 400, if you go directly to google.com, you will get 302 (and then 200 if you forward to the next page... well I do because it forwards to google.com.br, so you might not get that), and if you go to "googlecom" you will get a 0 (host no found), so with the last one, there is nobody to send a code back.

Tested using the code below.

<pre><code>&lt;?php

$html_brand = "www.google.com";
$ch = curl_init();

$options = array(
 CURLOPT_URL =&gt; $html_brand,
 CURLOPT_RETURNTRANSFER =&gt; true,
 CURLOPT_HEADER =&gt; true,
 CURLOPT_FOLLOWLOCATION =&gt; true,
 CURLOPT_ENCODING =&gt; "",
 CURLOPT_AUTOREFERER =&gt; true,
 CURLOPT_CONNECTTIMEOUT =&gt; 120,
 CURLOPT_TIMEOUT =&gt; 120,
 CURLOPT_MAXREDIRS =&gt; 10,
);
curl_setopt_array( $ch, $options );
$response = curl_exec($ch); 
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

if ( $httpCode != 200 ){
 echo "Return code is {$httpCode} \n"
 .curl_error($ch);
} else {
 echo "&lt;pre&gt;".htmlspecialchars($response)."&lt;/pre&gt;";
}

curl_close($ch);
</code></pre>

blocks|key|592041|text|检查curl_getinfo后面的curl_error，找出隐藏的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|592042|if(curl_errno($ch)){+++
++++echo+'Curl+error:+'+.+curl_error($ch);
}|code-block|syntax|javascript|592043|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.curl-error.php^0|H|A|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

check the <a href="http://php.net/manual/en/function.curl-error.php" rel="noreferrer">curl_error</a> after the curl_getinfo to find out the hidden errors. 

<pre><code>if(curl_errno($ch)){ 
 echo 'Curl error: ' . curl_error($ch);
}
</code></pre>

blocks|key|376281|text|我遇到了同样的问题，在我的例子中，这是因为在php.ini中禁用了curl_exec功能。检查日志：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|376282|PHP+Warning:++curl_exec()+has+been+disabled+for+security+reasons+in+/var/www/***/html/test.php+on+line+18|code-block|syntax|javascript|376283|解决方案是从服务器配置文件上php.ini中禁用功能中删除curl_exec。|376284|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had same problem and in my case this was because curl_exec function is disabled in php.ini. Check for logs:

<pre><code>PHP Warning: curl_exec() has been disabled for security reasons in /var/www/***/html/test.php on line 18
</code></pre>

Solution is remove curl_exec from disabled functions in php.ini on server configuration file.

blocks|key|376382|text|PHP返回http代码0的另一个原因是超时。在我的例子中，我有以下配置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|376383|curl_setopt($http，CURLOPT_TIMEOUT_MS,500)；|376384|事实证明，对我所指向的端点的请求总是花费超过500ms的时间，总是超时并且总是返回http代码0。|376385|如果您删除此设置(CURLOPT_TIMEOUT_MS)或设置一个更高的值(在我的示例中为5000)，您将得到实际的http代码，在我的示例中为200+(与预期一样)。|376386|请参阅https://www.php.net/manual/en/function.curl-setopt.php|offset|length|376387|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/manual/en/function.curl-setopt.php^0|0|0|0|0|3|1I|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$J|Y|K|Z|1|10]]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

Another reason for PHP to return http code 0 is timeout.
In my case, I had the following configuration:

curl_setopt($http, CURLOPT_TIMEOUT_MS,500);

It turned out that the request to the endpoint I was pointing to always took more than 500 ms, always timing out and always returning http code 0.

If you remove this setting (CURLOPT_TIMEOUT_MS) or put a higher value (in my case 5000), you'll get the actual http code, in my case a 200 (as expected).

See <a href="https://www.php.net/manual/en/function.curl-setopt.php" rel="nofollow noreferrer">https://www.php.net/manual/en/function.curl-setopt.php</a>

blocks|key|376399|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|376400|curl_setopt($ch,+CURLOPT_SSL_VERIFYPEER,+0);|code-block|syntax|javascript|376401|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:
<pre><code>curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
</code></pre>

blocks|key|592246|text|如果您使用的是selinux，这可能是因为安全限制。尝试将其设置为root：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|592247|#+setsebool+-P+httpd_can_network_connect+on|code-block|syntax|javascript|592248|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you're using selinux it might be because of security restrictions. Try setting this as root:
<pre><code># setsebool -P httpd_can_network_connect on
</code></pre>

blocks|key|376461|text|对我来说，发出wat+the+URL，直到我编码了url参数值，我才得到http代码0。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|376462|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me, issue wat the URL, untill I encoded url parameter values, I got http code 0.

I dont understand when I echo $httpCode I always get 0, I was expecting 404 when I change $html_brand into a broken url. Is there anything that I miss or do not know of? Thanks.

<pre><code> //check if url exist
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $html_brand);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$response = curl_exec($ch); 
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

if ($httpCode == 404) {
 echo "The Web Page Cannot Be Found";
 return;
}
curl_close($ch);
</code></pre>

PHP cURL HTTP CODE return 0

服务器

我不明白当我回显$httpCode的时候我总是得到0，当我把$html_brand改成一个坏掉的url时我还以为是404呢。有什么是我错过或不知道的吗？谢谢。 //check if url exist$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $html_brand)...

问PHP cURL HTTP代码返回%0
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