header_remove

实例

例子 1

删除特定标头：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token function">header</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Expires: Mon, 26 Jul 1997 05:00:00 GMT"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">header</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Cache-Control: no-cache"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">header</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Pragma: no-cache"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">header_remove</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Pragma"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

例子 2

删除所有先前设置的标头：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token function">header</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Expires: Mon, 26 Jul 1997 05:00:00 GMT"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">header</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Cache-Control: no-cache"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">header</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Pragma: no-cache"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">header_remove</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

例子解释：

在这个示例中，所有通过 header() 函数先前设置的 HTTP 标头（"Expires"、"Cache-Control" 和 "Pragma"）都将通过调用 header_remove() 函数（不带参数）而被移除。这意味着 HTTP 响应将不包含这些标头信息。这在某些情况下可能很有用，特别是当你希望重置或清除先前设置的标头信息时。但是，请注意，header_remove() 函数不会影响 PHP 已经发送给客户端的标头；它只影响在函数调用时仍处于待处理状态的标头。