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123 lines
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HTML
123 lines
6.0 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>将 WebP 格式的图像输出到浏览器或文件</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.imagewebp" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagewebp</h1>
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<p class="verinfo">(PHP 5 >= 5.4.0, PHP 7)</p><p class="refpurpose"><span class="refname">imagewebp</span> — <span class="dc-title">将 WebP 格式的图像输出到浏览器或文件</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagewebp-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>imagewebp</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$to</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$quality</code><span class="initializer"> = 80</span></span>
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]] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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将 <code class="parameter">image</code> 参数指定的图像以 WebP 格式输出到浏览器或者保存到文件。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagewebp-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">image</code></dt>
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<dd>
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<p class="para">由图象创建函数(例如<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>
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<dt>
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<code class="parameter">to</code></dt>
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<dd>
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<p class="para">文件保存的路径，如果未设置或为 <strong><code>NULL</code></strong>，将会直接输出原始图象流。</p>
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</dd>
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<dt>
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<code class="parameter">quality</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">quality</code> 范围从0（最低质量，最小文件体积）到100 （最好质量, 最大文件体积）。
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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.imagewebp-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.imagewebp-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>5.4.0</td>
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<td>
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支持把 <span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span> 流作为
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<code class="parameter">to</code> 参数传入。
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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.imagewebp-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-3745">
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<p><strong>Example #1 保存为 WebP 图像文件</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: #FF8000">// 创建一个空图像并在其上加入一些文字<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">120</span><span style="color: #007700">, </span><span style="color: #0000BB">20</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$text_color </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">233</span><span style="color: #007700">, </span><span style="color: #0000BB">14</span><span style="color: #007700">, </span><span style="color: #0000BB">91</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #DD0000">'WebP with PHP'</span><span style="color: #007700">, </span><span style="color: #0000BB">$text_color</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 保存图像<br /></span><span style="color: #0000BB">imagewebp</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #DD0000">'php.webp'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 释放内存<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<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></div></div></body></html> |