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80 lines
5.9 KiB
HTML
80 lines
5.9 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>检查图像是否为真彩色图像</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.imageistruecolor" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imageistruecolor</h1>
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<p class="verinfo">(PHP 4 >= 4.3.2, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imageistruecolor</span> — <span class="dc-title">检查图像是否为真彩色图像</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imageistruecolor-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>imageistruecolor</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="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>imageistruecolor()</strong></span> 检查
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<code class="parameter">image</code> 图像是否为真彩色图像。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imageistruecolor-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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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.imageistruecolor-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果 <code class="parameter">image</code> 是真彩色图像返回 <strong><code>TRUE</code></strong>，否则返回 <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.imageistruecolor-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-3716">
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<p><strong>Example #1 Simple detection of true color image instances using <span class="function"><strong>imageistruecolor()</strong></span></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">// $im is an image instance<br /><br />// Check if image is a true color image or not<br /></span><span style="color: #007700">if(!</span><span style="color: #0000BB">imageistruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">))<br />{<br /> </span><span style="color: #FF8000">// Create a new true color image instance<br /> </span><span style="color: #0000BB">$tc </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">), </span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">));<br /><br /> </span><span style="color: #0000BB">imagecopy</span><span style="color: #007700">(</span><span style="color: #0000BB">$tc</span><span style="color: #007700">, </span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">), </span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">));<br /> </span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">$tc</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$tc </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// Continue working with image instance<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.imageistruecolor-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">此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.imageistruecolor-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="imagecreatetruecolor.html" class="function" rel="rdfs-seeAlso">imagecreatetruecolor()</a> - 新建一个真彩色图像</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> |