လက်ရှိတည်နေရာ: ပင်မစာမျက်နှာ> နောက်ဆုံးရဆောင်းပါးများစာရင်း> GetMxrrr function အတွက်အသုံးများသောအသုံးပြုမှုနည်းလမ်းများနှင့်နည်းစနစ်များကဘာတွေလဲ။

GetMxrrr function အတွက်အသုံးများသောအသုံးပြုမှုနည်းလမ်းများနှင့်နည်းစနစ်များကဘာတွေလဲ။

gitbox 2025-06-12

在 php 中, getmxrr ()是一个用于获取指定域名的 MX) 记录的函数 .MX 记录是域名系统 (DNS) 中的一项记录类型, 通过။ 通过getMXrr ()函数, 开发者可以轻松地获取某个域名的 mx 记录, 以便进行邮件相关的操作, 开发者可以轻松地获取某个域名的 mx 记录, 以便进行邮件相关的操作, 比如验证域名是否可以接收邮件, 或是根据, 或是根据, 或是根据, 或是根据, 或是根据, 或是根据, 或是根据, 或是根据, 或是根据, 或是根据

基本用法

GetMxrrr ()函数的基本语法如下:

 <span><span><span class="hljs-keyword">bool</span></span><span> </span><span><span class="hljs-title function_ invoke__">getmxrr</span></span><span> ( </span><span><span class="hljs-keyword">string</span></span><span> </span><span><span class="hljs-variable">$hostname</span></span><span> , </span><span><span class="hljs-keyword">array</span></span><span> &amp;</span><span><span class="hljs-variable">$mxhosts</span></span><span> [, </span><span><span class="hljs-keyword">array</span></span><span> &amp;</span><span><span class="hljs-variable">$weight</span></span><span> = </span><span><span class="hljs-literal">NULL</span></span><span> ] )
</span></span>

参数说明:

  • $ hostname : 指定要查询的域名။

  • $ mxhosts : 一个数组, 返回 mx 记录服务器的地址။

  • $ အလေးချိန် (可选): 返回的数组, 用于存储对应 mx 服务器的权重 (优先级) ။ 权重较低的服务器具有较高的优先级။

返回值:

  • 如果成功, 返回True , 并且$ mxhosts和$ အလေးချိန်将分别存储服务器地址和权重။

  • 如果失败, 返回false返回 false 并且$ mxhosts和$ အလေးချိန်数组将为空။

示例代码:

 <span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-variable">$hostname</span></span><span> = </span><span><span class="hljs-string">"example.com"</span></span><span>;
</span><span><span class="hljs-variable">$mxhosts</span></span><span> = [];
</span><span><span class="hljs-variable">$weight</span></span><span> = [];

</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">getmxrr</span></span><span>(</span><span><span class="hljs-variable">$hostname</span></span><span>, </span><span><span class="hljs-variable">$mxhosts</span></span><span>, </span><span><span class="hljs-variable">$weight</span></span><span>)) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"MX Records for <span class="hljs-subst">$hostname</span></span></span><span>:\n";
    </span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$mxhosts</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$index</span></span><span> =&gt; </span><span><span class="hljs-variable">$host</span></span><span>) {
        </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Host: <span class="hljs-subst">$host</span></span></span><span>, Weight: " . </span><span><span class="hljs-variable">$weight</span></span><span>[</span><span><span class="hljs-variable">$index</span></span><span>] . </span><span><span class="hljs-string">"\n"</span></span><span>;
    }
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Failed to retrieve MX records for <span class="hljs-subst">$hostname</span></span></span><span>.\n";
}
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

在上面的代码中, getMxrrr ()会获取会获取ဥပမာ域名的 mx 记录, 并将其存储在$ mxhosts和$ အလေးချိန်数组中။ 数组中, 遍历输出每个邮件服务器的地址和其对应的权重, 遍历输出每个邮件服务器的地址和其对应的权重။

常见技巧与应用

1 ။ 验证域名是否可接收邮件

通过getMxrr ()函数, 开发者可以验证一个域名是否配置了邮件服务器, 从而判断该域名是否能够接收邮件။ 如果获取到的 mx 记录不为空, 则说明该域名能够接收邮件။

 <span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">isMailServerAvailable</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$domain</span></span></span><span>) {
    </span><span><span class="hljs-variable">$mxhosts</span></span><span> = [];
    </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">getmxrr</span></span><span>(</span><span><span class="hljs-variable">$domain</span></span><span>, </span><span><span class="hljs-variable">$mxhosts</span></span><span>)) {
        </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">true</span></span><span>;  </span><span><span class="hljs-comment">// &#26377;MX&#35760;&#24405;&#65292;&#34920;&#31034;&#21487;&#20197;&#25509;&#25910;&#37038;&#20214;</span></span><span>
    }
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">false</span></span><span>;  </span><span><span class="hljs-comment">// &#26080;MX&#35760;&#24405;&#65292;&#34920;&#31034;&#19981;&#21487;&#25509;&#25910;&#37038;&#20214;</span></span><span>
}

</span><span><span class="hljs-variable">$domain</span></span><span> = </span><span><span class="hljs-string">"example.com"</span></span><span>;
</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">isMailServerAvailable</span></span><span>(</span><span><span class="hljs-variable">$domain</span></span><span>)) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<span class="hljs-subst">$domain</span></span></span><span> &#21487;&#20197;&#25509;&#25910;&#37038;&#20214;\n";
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<span class="hljs-subst">$domain</span></span></span><span> &#26080;&#27861;&#25509;&#25910;&#37038;&#20214;\n";
}
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

2 ။ 查找最优的邮件服务器

根据 mx 记录的权重值, 优先级较低的服务器会被优先使用။ 通过getMxrr ()获取的权重数组, 可以帮助开发者找到优先级最高的邮件服务器, 可以帮助开发者找到优先级最高的邮件服务器။

 <span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">getBestMailServer</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$domain</span></span></span><span>) {
    </span><span><span class="hljs-variable">$mxhosts</span></span><span> = [];
    </span><span><span class="hljs-variable">$weights</span></span><span> = [];
    
    </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">getmxrr</span></span><span>(</span><span><span class="hljs-variable">$domain</span></span><span>, </span><span><span class="hljs-variable">$mxhosts</span></span><span>, </span><span><span class="hljs-variable">$weights</span></span><span>)) {
        </span><span><span class="hljs-variable">$bestServerIndex</span></span><span> = </span><span><span class="hljs-title function_ invoke__">array_search</span></span><span>(</span><span><span class="hljs-title function_ invoke__">min</span></span><span>(</span><span><span class="hljs-variable">$weights</span></span><span>), </span><span><span class="hljs-variable">$weights</span></span><span>);
        </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-variable">$mxhosts</span></span><span>[</span><span><span class="hljs-variable">$bestServerIndex</span></span><span>];
    }
    
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">null</span></span><span>;
}

</span><span><span class="hljs-variable">$domain</span></span><span> = </span><span><span class="hljs-string">"example.com"</span></span><span>;
</span><span><span class="hljs-variable">$bestServer</span></span><span> = </span><span><span class="hljs-title function_ invoke__">getBestMailServer</span></span><span>(</span><span><span class="hljs-variable">$domain</span></span><span>);
</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$bestServer</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"&#26368;&#20248;&#30340;&#37038;&#20214;&#26381;&#21153;&#22120;&#26159;: <span class="hljs-subst">$bestServer</span></span></span><span>\n";
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"&#26080;&#27861;&#25214;&#21040;&#37038;&#20214;&#26381;&#21153;&#22120;\n"</span></span><span>;
}
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

此代码会根据权重数组的最小值 (即优先级最高的服务器) 来找出最优的邮件服务器။

3 ။ 过滤和选择特定的邮件服务器

在某些情况下, 开发者可能只对某些特定的邮件服务器感兴趣, 比如选择一个特定区域的邮件服务器或特定类型的服务器။ 可以在获取 mx 记录后, 通过简单的数组过滤来实现这一需求။

 <span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">filterMailServers</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$domain</span></span></span><span>, </span><span><span class="hljs-variable">$filter</span></span><span>) {
    </span><span><span class="hljs-variable">$mxhosts</span></span><span> = [];
    </span><span><span class="hljs-variable">$weights</span></span><span> = [];
    
    </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">getmxrr</span></span><span>(</span><span><span class="hljs-variable">$domain</span></span><span>, </span><span><span class="hljs-variable">$mxhosts</span></span><span>, </span><span><span class="hljs-variable">$weights</span></span><span>)) {
        </span><span><span class="hljs-variable">$filteredHosts</span></span><span> = </span><span><span class="hljs-title function_ invoke__">array_filter</span></span><span>(</span><span><span class="hljs-variable">$mxhosts</span></span><span>, function(</span><span><span class="hljs-variable">$host</span></span><span>) </span><span><span class="hljs-keyword">use</span></span><span> ($</span><span><span class="hljs-title">filter</span></span><span>) {
            </span><span><span class="hljs-title">return</span></span><span> </span><span><span class="hljs-title">strpos</span></span><span>($</span><span><span class="hljs-title">host</span></span><span>, $</span><span><span class="hljs-title">filter</span></span><span>) !== </span><span><span class="hljs-title">false</span></span><span>;  </span><span><span class="hljs-comment">// &#36807;&#28388;&#20986;&#21253;&#21547;&#25351;&#23450;&#23383;&#31526;&#20018;&#30340;&#37038;&#20214;&#26381;&#21153;&#22120;</span></span><span>
        });
        </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-variable">$filteredHosts</span></span><span>;
    }
    
    </span><span><span class="hljs-keyword">return</span></span><span> [];
}

</span><span><span class="hljs-variable">$domain</span></span><span> = </span><span><span class="hljs-string">"example.com"</span></span><span>;
</span><span><span class="hljs-variable">$filteredServers</span></span><span> = </span><span><span class="hljs-title function_ invoke__">filterMailServers</span></span><span>(</span><span><span class="hljs-variable">$domain</span></span><span>, </span><span><span class="hljs-string">"gmail"</span></span><span>);

</span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-keyword">empty</span></span><span>(</span><span><span class="hljs-variable">$filteredServers</span></span><span>)) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"&#36807;&#28388;&#21518;&#30340;&#37038;&#20214;&#26381;&#21153;&#22120;:\n"</span></span><span>;
    </span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$filteredServers</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$server</span></span><span>) {
        </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-variable">$server</span></span><span> . </span><span><span class="hljs-string">"\n"</span></span><span>;
    }
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"&#26410;&#25214;&#21040;&#31526;&#21512;&#26465;&#20214;&#30340;&#37038;&#20214;&#26381;&#21153;&#22120;\n"</span></span><span>;
}
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

在这个示例中, filter အပ်ပဏီ ()函数会过滤出所有包含gmail字符串的邮件服务器။

注意事项

  1. DNS 查询限制: GetMxrr ()函数依赖于 DNS 查询的正确性和稳定性။ 如果 DNS 服务器出现问题, 可能会导致查询失败။

  2. 结果顺序: GetMxrrr ()返回的 mx 记录是按照优先级顺序排列的, 优先级较低的服务器会出现在前面 (即更高优先级) ။

  3. 非标准返回值: 在某些情况下, 如果域名没有配置 mx 记录, 函数返回မှားသော ။ 此时需要合理处理错误情况။

  4. 安全性: 尽管getMxrrr ()是一个常用的 dns 查询工具, 但在公共环境中使用时, 开发者应该注意避免信息泄露, 特别是当暴露在外部系统时, 特别是当暴露在外部系统时။

总结

GetMXrrr ()是 php 中一个简单但功能强大的函数, 适用于各种需要获取和操作 mx 记录的场景။ 无论是进行邮件验证, 寻找最优邮件服务器, 还是实现邮件路由策略, getmxrr ()都能够提供重要的帮助, 可以在邮件系统的搭建和维护中提高效率, 可以在邮件系统的搭建和维护中提高效率။

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