fsockopen("smtp.163.com", 25, "", "", 10);
false,
FSOCKOPENfalse
fsockopen("smtp.163.com", 25, "", "", 10);
false,
FSOCKOPENfalsegenerally closes port 25. You need to ask your service provider whether port 25 is open
$handler = fsockopen('smtp.163.com', 26, $errcode, $errmsg, 10);
var_dump($errcode, $errmsg, $handler);pfsockopen-Open a persistent network connection or Unix socket connection.
resource fsockopen (string $hostname [, int $port =-1 [, int & $errno [, string & $errstr [, float $timeout = ini_get ("default_socket_timeout")])
as you can see from the document, int & $errno and string & $errstr are reference types and cannot be assigned directly.
the result of execution in PHP 5.6 / PHP 7.1.16 (cli) is as follows
Fatal error: Only variables can be passed by reference in xxx.php on line 2
the modified code is as follows
<?php
$res = fsockopen('smtp.163.com', 25, $errno, $errmsg, 10);
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