在使用flush函數之前，哪些PHP函數是必須先調用的？使用順序全指南

M66 2025-08-07

正確調用順序示例：

 <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">// 開啟輸出緩衝</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"第一段輸出\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緩衝區內容，推送到服務器</span></span><span>
</span><span><span class="hljs-title function_ invoke__">flush</span></span><span>();                   </span><span><span class="hljs-comment">// 發送內容到瀏覽器</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">// 模擬耗時操作</span></span><span>

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"第二段輸出\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">// 關閉緩衝，發送剩餘內容</span></span><span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

通過掌握這些關鍵函數的調用順序，你可以讓flush()發揮最大效用，實現實時輸出和更佳用戶體驗。

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