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  1. <?php
  2. $host = 'mx1.mail.yahoo.co.jp';
  3. $port = 25;
  4. $timeout = 5; // 秒
  5.  
  6. echo "⏳ 正在测试连接 $host:$port ...\n";
  7.  
  8. $connection = @fsockopen($host, $port, $errno, $errstr, $timeout);
  9.  
  10. if ($connection) {
  11.     $response = fgets($connection, 1024);
  12.     echo "✅ 连接成功：\n$response";
  13.     fclose($connection);
  14. } else {
  15.     echo "❌ 连接失败：$errstr ($errno)\n";
  16. }
Success #stdin #stdout 0.03s 26020KB
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stdin
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Standard input is empty
stdout
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⏳ 正在测试连接 mx1.mail.yahoo.co.jp:25 ...
❌ 连接失败：php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution (0)
https://ideone.com/MdncSf
language:
PHP (php 7.3.5)
created:
9 hours ago
visibility:
public

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