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<!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>输出图象到浏览器或文件。</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.imagejpeg" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagejpeg</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagejpeg</span> — <span class="dc-title">输出图象到浏览器或文件。</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagejpeg-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>imagejpeg</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$quality</code></span>
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]] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>imagejpeg()</strong></span> 从 <code class="parameter">image</code>
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图像以 <code class="parameter">filename</code> 为文件名创建一个
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<acronym title="Joint Photographic Experts Group">JPEG</acronym> 图像。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagejpeg-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">filename</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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<p class="para">
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如果要省略这个参数而提供
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<code class="parameter">quality</code> 参数，使用NULL。
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</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> 为可选项，范围从
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0（最差质量，文件更小）到 100（最佳质量，文件最大）。默认为
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IJG 默认的质量值（大约 75）。
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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.imagejpeg-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 examples" id="refsect1-function.imagejpeg-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-3717">
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<p><strong>Example #1 输出 JPEG 图像</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">// 创键空白图像并添加一些文本<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 /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #DD0000">'A Simple Text String'</span><span style="color: #007700">, </span><span style="color: #0000BB">$text_color</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 设置内容类型标头 —— 这个例子里是 image/jpeg<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-Type: image/jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 输出图像<br /></span><span style="color: #0000BB">imagejpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 释放内存<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$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 class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="mediaobject">
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<div class="imageobject">
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<img src="images/21009b70229598c6a80eef8b45bf282b-imagejpeg.jpg" alt="例子的输出：输出 JPEG 图像" width="120" height="20" />
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</div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-3718">
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<p><strong>Example #2 保存一副 JPEG 图像</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">// 创键空白图像并添加一些文本<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">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">233</span><span style="color: #007700">, </span><span style="color: #0000BB">14</span><span style="color: #007700">, </span><span style="color: #0000BB">91</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">'A Simple Text String'</span><span style="color: #007700">, </span><span style="color: #0000BB">$text_color</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 保存图像为 'simpletext.jpg'<br /></span><span style="color: #0000BB">imagejpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #DD0000">'simpletext.jpg'</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">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-3719">
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<p><strong>Example #3 以 75% 的图像质量输出图像</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// 创键空白图像并添加一些文本<br /></span><span style="color: #0000BB">$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 /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #DD0000">'A Simple Text String'</span><span style="color: #007700">, </span><span style="color: #0000BB">$text_color</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 设置内容类型标头 —— 这个例子里是 image/jpeg<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-Type: image/jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 使用 NULL 跳过 filename 参数，并设置图像质量为 75%<br /></span><span style="color: #0000BB">imagejpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">NULL</span><span style="color: #007700">, </span><span style="color: #0000BB">75</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 释放内存<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$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 class="refsect1 notes" id="refsect1-function.imagejpeg-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">JPEG 支持仅在 PHP 与 GD-1.8 或更高版本一起编译时可用。</span></p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果想输出渐进式 JPEG，需要用
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<span class="function"><a href="imageinterlace.html" class="function">imageinterlace()</a></span> 函数将隔行扫描比特置位。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.imagejpeg-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="imagepng.html" class="function" rel="rdfs-seeAlso">imagepng()</a> - 以 PNG 格式将图像输出到浏览器或文件</span></li>
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<li class="member"><span class="function"><a href="imagegif.html" class="function" rel="rdfs-seeAlso">imagegif()</a> - 输出图象到浏览器或文件。</span></li>
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<li class="member"><span class="function"><a href="imagewbmp.html" class="function" rel="rdfs-seeAlso">imagewbmp()</a> - 以 WBMP 格式将图像输出到浏览器或文件</span></li>
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<li class="member"><span class="function"><a href="imageinterlace.html" class="function" rel="rdfs-seeAlso">imageinterlace()</a> - 激活或禁止隔行扫描</span></li>
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<li class="member"><span class="function"><a href="imagetypes.html" class="function" rel="rdfs-seeAlso">imagetypes()</a> - 返回当前 PHP 版本所支持的图像类型</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> |