📄 function.imagecolorsforindex.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Get the colors for an index</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagecolorset.html">imagecolorset</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagecolorstotal.html">imagecolorstotal</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.imagecolorsforindex" class="refentry"> <div class="refnamediv"> <h1 class="refname">imagecolorsforindex</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">imagecolorsforindex</span> — <span class="dc-title">Get the colors for an index</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><b><b>imagecolorsforindex</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$image</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$index</tt></span> )</div> <p class="para rdfs-comment"> Gets the color for a specified index. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt><span class="term"><i><tt class="parameter">image</tt></i></span><dd><p class="para">An image resource, returned by one of the image creation functions, such as <a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a>.</p></dd></dt> <dt> <span class="term"><i><tt class="parameter">index</tt></i></span> <dd> <p class="para"> The color index. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an associative array with red, green, blue and alpha keys that contain the appropriate values for the specified color index. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>imagecolorsforindex()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// open an image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefrompng</span><span style="color: #007700">(</span><span style="color: #DD0000">'nexen.png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// get a color<br /></span><span style="color: #0000BB">$start_x </span><span style="color: #007700">= </span><span style="color: #0000BB">40</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$start_y </span><span style="color: #007700">= </span><span style="color: #0000BB">50</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$color_index </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorat</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">$start_x</span><span style="color: #007700">, </span><span style="color: #0000BB">$start_y</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// make it human readable<br /></span><span style="color: #0000BB">$color_tran </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorsforindex</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">$color_index</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// what is it ?<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$color_tran</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>Array( [red] => 226 [green] => 222 [blue] => 252 [alpha] => 0)</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.imagecolorat.html" class="function" rel="rdfs-seeAlso">imagecolorat()</a></li> <li class="member"><a href="function.imagecolorexact.html" class="function" rel="rdfs-seeAlso">imagecolorexact()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagecolorset.html">imagecolorset</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagecolorstotal.html">imagecolorstotal</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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