在使用flush函数之前，哪些PHP函数是必须先调用的？使用顺序全指南

M66 2025-08-07

正确调用顺序示例：

<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-title function_ invoke__">ob_start</span></span><span>();                </span><span><span class="hljs-comment">// 开启输出缓冲</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"第一段输出\n"</span></span><span>;
</span><span><span class="hljs-title function_ invoke__">ob_flush</span></span><span>();                </span><span><span class="hljs-comment">// 清空PHP缓冲区内容，推送到服务器</span></span><span>
</span><span><span class="hljs-title function_ invoke__">flush</span></span><span>();                   </span><span><span class="hljs-comment">// 发送内容到浏览器</span></span><span>

</span><span><span class="hljs-title function_ invoke__">sleep</span></span><span>(</span><span><span class="hljs-number">2</span></span><span>);                  </span><span><span class="hljs-comment">// 模拟耗时操作</span></span><span>

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"第二段输出\n"</span></span><span>;
</span><span><span class="hljs-title function_ invoke__">ob_flush</span></span><span>();
</span><span><span class="hljs-title function_ invoke__">flush</span></span><span>();

</span><span><span class="hljs-title function_ invoke__">ob_end_flush</span></span><span>();            </span><span><span class="hljs-comment">// 关闭缓冲，发送剩余内容</span></span><span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

通过掌握这些关键函数的调用顺序，你可以让flush()发挥最大效用，实现实时输出和更佳用户体验。

<span></span>

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