Probe whether a remote host:port accepts connections, with a configurable timeout. Useful for quick health checks in deploy scripts.
PHP
<?php
function isPortOpen(string $host, int $port, float $timeoutSec = 2.0): bool {
$fp = @fsockopen($host, $port, $errno, $errstr, $timeoutSec);
if ($fp) { fclose($fp); return true; }
return false;
}
var_dump(isPortOpen('google.com', 443)); // true
var_dump(isPortOpen('google.com', 12345)); // false
var_dump(isPortOpen('localhost', 3306)); // true if MySQL is running locallySave your own code snippets
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