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PHP CURL with proxy calls CLOSE_WAIT on socket

I use the PHP curl library to establish a connection and retrieve content from the WEB - normal.

I have several SOCKS5 proxies running on localhost on ports from 10300 to 10350, and PHP randomly selects a port.

My code is:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_PROXY, "localhost:".mt_rand(10300, 10350));
curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$curl_resp = curl_exec($ch);
curl_close($ch);
/// ... whatever logic

But if I put this code into the loop for a long time, I get an error that no more files can be opened. I read online because the file limit was reached, so I was debugging with lsof -p, and I noticed that the process has hundreds and even thousands of the following lines:

... TCP localhost:43030->localhost:10303 (CLOSE_WAIT)
... TCP localhost:40982->localhost:10341 (CLOSE_WAIT)
... TCP localhost:48718->localhost:10304 (CLOSE_WAIT)
... TCP localhost:41655->localhost:10350 (CLOSE_WAIT)
... TCP localhost:41915->localhost:10310 (CLOSE_WAIT)
... TCP localhost:49746->localhost:10322 (ESTABLISHED)

I studied why this is so, but I do not understand, because I call curl_close, and I would suggest that CURL will also close the PROXY connection, or am I missing something?

Versions:

PHP 7.1.4-1+deb.sury.org~trusty+1 (cli) (built: Apr 11 2017 22:45:20) (NTS)
curl 7.52.1 (x86_64-pc-linux-gnu) libcurl/7.52.1 OpenSSL/1.0.1f zlib/1.2.8 libidn2/0.9 libpsl/0.11.0 (+libicu/52.1) libssh2/1.4.3 nghttp2/1.19.0 librtmp/2.3
+2
1

. -

curl_setopt($ch, CURLOPT_HTTPHEADER, array("Connection: close"));

, php7, php7, php5 . , php7, . .

0

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