<p>在开启CDN后，如何利用PHP获取用户真实IP的方法</p><div style="background-color:#1e1f22;color:#bcbec4"><pre style="font-family:'JetBrains Mono',monospace;font-size:9.8pt;"><span style="color:#5f826b;font-style:italic;">/**<br></span><span style="color:#5f826b;font-style:italic;"> * </span><span style="color:#5f826b;font-style:italic;font-family:'宋体',monospace;">获取 </span><span style="color:#5f826b;font-style:italic;">CDN </span><span style="color:#5f826b;font-style:italic;font-family:'宋体',monospace;">后的真实客户端 </span><span style="color:#5f826b;font-style:italic;">IP<br></span><span style="color:#5f826b;font-style:italic;"> * </span><span style="color:#5f826b;font-style:italic;font-family:'宋体',monospace;">优先级：</span><span style="color:#5f826b;font-style:italic;">CDN </span><span style="color:#5f826b;font-style:italic;font-family:'宋体',monospace;">专用头 </span><span style="color:#5f826b;font-style:italic;">> X-Forwarded-For </span><span style="color:#5f826b;font-style:italic;font-family:'宋体',monospace;">首段 </span><span style="color:#5f826b;font-style:italic;">> X-Real-IP > REMOTE_ADDR<br></span><span style="color:#5f826b;font-style:italic;"> */<br></span><span style="color:#cf8e6d;">function </span><span style="color:#6f737a;">getRealClientIp</span>()<br>{<br> <span style="color:#9876aa;">$ipHeaders </span>= [<br> <span style="color:#6aab73;">'Ali-CDN-Real-IP'</span>, <span style="color:#7a7e85;">// </span><span style="color:#7a7e85;font-family:'宋体',monospace;">阿里云<br></span><span style="color:#7a7e85;font-family:'宋体',monospace;"> </span><span style="color:#6aab73;">'TX-Client-IP'</span>, <span style="color:#7a7e85;">// </span><span style="color:#7a7e85;font-family:'宋体',monospace;">腾讯云<br></span><span style="color:#7a7e85;font-family:'宋体',monospace;"> </span><span style="color:#6aab73;">'CF-Connecting-IP'</span>, <span style="color:#7a7e85;">// Cloudflare<br></span><span style="color:#7a7e85;"> </span><span style="color:#6aab73;">'X-Real-IP'</span>, <span style="color:#7a7e85;">// </span><span style="color:#7a7e85;font-family:'宋体',monospace;">又拍云</span><span style="color:#7a7e85;">/Nginx<br></span><span style="color:#7a7e85;"> </span><span style="color:#6aab73;">'Client-IP'</span>, <span style="color:#7a7e85;">// </span><span style="color:#7a7e85;font-family:'宋体',monospace;">百度云<br></span><span style="color:#7a7e85;font-family:'宋体',monospace;"> </span><span style="color:#6aab73;">'X-Forwarded-For'</span>, <span style="color:#7a7e85;">// </span><span style="color:#7a7e85;font-family:'宋体',monospace;">通用（需取首段）<br></span><span style="color:#7a7e85;font-family:'宋体',monospace;"> </span>];<br><br> <span style="color:#cf8e6d;">foreach </span>(<span style="color:#9876aa;">$ipHeaders </span><span style="color:#cf8e6d;">as </span><span style="color:#9876aa;">$header</span>) {<br> <span style="color:#cf8e6d;">if </span>(!<span style="color:#cf8e6d;">empty</span>(<span style="color:#9876aa;">$_SERVER</span>[<span style="color:#6aab73;">'HTTP_' </span>. <span style="color:#57aaf7;">strtoupper</span>(<span style="color:#57aaf7;">str_replace</span>(<span style="color:#6aab73;">'-'</span>, <span style="color:#6aab73;">'_'</span>, <span style="color:#9876aa;">$header</span>))])) {<br> <span style="color:#9876aa;">$ip </span>= <span style="color:#9876aa;">$_SERVER</span>[<span style="color:#6aab73;">'HTTP_' </span>. <span style="color:#57aaf7;">strtoupper</span>(<span style="color:#57aaf7;">str_replace</span>(<span style="color:#6aab73;">'-'</span>, <span style="color:#6aab73;">'_'</span>, <span style="color:#9876aa;">$header</span>))];<br><br> <span style="color:#7a7e85;">// X-Forwarded-For </span><span style="color:#7a7e85;font-family:'宋体',monospace;">可能是逗号分隔的链，取第一个（最近代理）<br></span><span style="color:#7a7e85;font-family:'宋体',monospace;"> </span><span style="color:#cf8e6d;">if </span>(<span style="color:#9876aa;">$header </span>=== <span style="color:#6aab73;">'X-Forwarded-For'</span>) {<br> <span style="color:#9876aa;">$ip </span>= <span style="color:#57aaf7;">trim</span>(<span style="color:#57aaf7;">explode</span>(<span style="color:#6aab73;">','</span>, <span style="color:#9876aa;">$ip</span>)[<span style="color:#2aacb8;">0</span>]);<br> }<br><br> <span style="color:#7a7e85;">// </span><span style="color:#7a7e85;font-family:'宋体',monospace;">验证</span><span style="color:#7a7e85;"> IP </span><span style="color:#7a7e85;font-family:'宋体',monospace;">格式<br></span><span style="color:#7a7e85;font-family:'宋体',monospace;"> </span><span style="color:#cf8e6d;">if </span>(<span style="color:#57aaf7;">filter_var</span>(<span style="color:#9876aa;">$ip</span>, <span style="color:#9876aa;font-style:italic;">FILTER_VALIDATE_IP</span>, <span style="color:#9876aa;font-style:italic;">FILTER_FLAG_NO_PRIV_RANGE </span>| <span style="color:#9876aa;font-style:italic;">FILTER_FLAG_NO_RES_RANGE</span>)) {<br> <span style="color:#cf8e6d;">return </span><span style="color:#9876aa;">$ip</span>;<br> }<br> }<br> }<br><br> <span style="color:#7a7e85;">// </span><span style="color:#7a7e85;font-family:'宋体',monospace;">兜底：直接连接</span><span style="color:#7a7e85;"> IP</span><span style="color:#7a7e85;font-family:'宋体',monospace;">（无</span><span style="color:#7a7e85;"> CDN </span><span style="color:#7a7e85;font-family:'宋体',monospace;">时）<br></span><span style="color:#7a7e85;font-family:'宋体',monospace;"> </span><span style="color:#cf8e6d;">return </span><span style="color:#9876aa;">$_SERVER</span>[<span style="color:#6aab73;">'REMOTE_ADDR'</span>] ?? <span style="color:#6aab73;">'0.0.0.0'</span>;<br>}</pre></div><p><br></p>
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