imagecolorsforindex.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.imagecolorsforindex" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>imagecolorsforindex</refname>
  <refpurpose>获取索引的颜色</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>imagecolorsforindex</methodname>
   <methodparam><type>GdImage</type><parameter>image</parameter></methodparam>
   <methodparam><type>int</type><parameter>color</parameter></methodparam>
  </methodsynopsis>
  <para>
   获取指定索引的颜色。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &gd.image.description;
    <varlistentry>
     <term><parameter>color</parameter></term>
     <listitem>
      <para>
       颜色索引。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回具有 red、green、blue 和 alpha 的键名的关联数组，包含了指定颜色索引的适当值。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &gd.changelog.image-param;
     <row>
      <entry>8.0.0</entry>
      <entry>
       如果 <parameter>color</parameter> 超出范围，<function>imagecolorsforindex</function>
       现在抛出 <classname>ValueError</classname> 异常；之前返回 &false;。
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>imagecolorsforindex</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

// 打开图像
$im = imagecreatefrompng('nexen.png');

// 获取颜色
$start_x = 40;
$start_y = 50;
$color_index = imagecolorat($im, $start_x, $start_y);

// 使其可读
$color_tran = imagecolorsforindex($im, $color_index);

// 显示该颜色的值
print_r($color_tran);

?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Array
(
   [red] => 226
   [green] => 222
   [blue] => 252
   [alpha] => 0
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>imagecolorat</function></member>
   <member><function>imagecolorexact</function></member>
  </simplelist>
 </refsect1>
</refentry>
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