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173 lines
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HTML
173 lines
7.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>取得嵌入在 TIFF 或 JPEG 图像中的缩略图</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.exif-thumbnail" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">exif_thumbnail</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">exif_thumbnail</span> — <span class="dc-title">取得嵌入在 TIFF 或 JPEG 图像中的缩略图</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.exif-thumbnail-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>exif_thumbnail</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter reference">&$width</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter reference">&$height</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter reference">&$imagetype</code></span>
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]]] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>exif_thumbnail()</strong></span> 读取 <acronym title="Tagged Image File Format">TIFF</acronym> 或 <acronym title="Joint Photographic Experts Group">JPEG</acronym>
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图像中的嵌入缩略图。如果图像不包含缩略图则返回 <strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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If you want to deliver thumbnails through this function, you should send
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the mimetype information using the <span class="function"><a href="header.html" class="function">header()</a></span> function.
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</p>
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<p class="para">
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It is possible that <span class="function"><strong>exif_thumbnail()</strong></span> cannot create an
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image but can determine its size. In this case, the return value is
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<strong><code>FALSE</code></strong> but <code class="parameter">width</code> and <code class="parameter">height</code>
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are set.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.exif-thumbnail-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">filename</code></dt>
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<dd>
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<p class="para">
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The name of the image file being read. This image contains an
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embedded thumbnail.
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</p>
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</dd>
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<dt>
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<code class="parameter">width</code></dt>
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<dd>
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<p class="para">
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The return width of the returned thumbnail.
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</p>
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</dd>
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<dt>
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<code class="parameter">height</code></dt>
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<dd>
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<p class="para">
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The returned height of the returned thumbnail.
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</p>
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</dd>
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<dt>
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<code class="parameter">imagetype</code></dt>
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<dd>
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<p class="para">
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The returned image type of the returned thumbnail. This is either
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<acronym title="Tagged Image File Format">TIFF</acronym> or <acronym title="Joint Photographic Experts Group">JPEG</acronym>.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.exif-thumbnail-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the embedded thumbnail, or <strong><code>FALSE</code></strong> if the image contains no
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thumbnail.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.exif-thumbnail-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>4.3.0</td>
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<td>
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The optional parameters <code class="parameter">width</code>,
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<code class="parameter">height</code>, and <code class="parameter">imagetype</code>
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all became available.
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</td>
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</tr>
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<tr>
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<td>4.3.0</td>
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<td>
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May return thumbnails in the <acronym title="Tagged Image File Format">TIFF</acronym> format.
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.exif-thumbnail-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-3636">
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<p><strong>Example #1 <span class="function"><strong>exif_thumbnail()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">array_key_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'file'</span><span style="color: #007700">,</span><span style="color: #0000BB">$_REQUEST</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$image </span><span style="color: #007700">= </span><span style="color: #0000BB">exif_thumbnail</span><span style="color: #007700">(</span><span style="color: #0000BB">$_REQUEST</span><span style="color: #007700">[</span><span style="color: #DD0000">'file'</span><span style="color: #007700">], </span><span style="color: #0000BB">$width</span><span style="color: #007700">, </span><span style="color: #0000BB">$height</span><span style="color: #007700">, </span><span style="color: #0000BB">$type</span><span style="color: #007700">);<br />} else {<br /> </span><span style="color: #0000BB">$image </span><span style="color: #007700">= </span><span style="color: #0000BB">false</span><span style="color: #007700">;<br />}<br />if (</span><span style="color: #0000BB">$image</span><span style="color: #007700">!==</span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-type: "</span><span style="color: #007700">.</span><span style="color: #0000BB">image_type_to_mime_type</span><span style="color: #007700">(</span><span style="color: #0000BB">$type</span><span style="color: #007700">));<br /> echo </span><span style="color: #0000BB">$image</span><span style="color: #007700">;<br /> exit;<br />} else {<br /> </span><span style="color: #FF8000">// no thumbnail available, handle the error here<br /> </span><span style="color: #007700">echo </span><span style="color: #DD0000">"No thumbnail available"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.exif-thumbnail-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="exif_read_data.html" class="function" rel="rdfs-seeAlso">exif_read_data()</a> - 从 JPEG 或 TIFF
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文件中读取 EXIF 头信息</span></li>
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<li class="member"><span class="function"><a href="image_type_to_mime_type.html" class="function" rel="rdfs-seeAlso">image_type_to_mime_type()</a> - 取得 getimagesize，exif_read_data，exif_thumbnail，exif_imagetype
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所返回的图像类型的 MIME 类型</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |