Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>    (PHP 3, PHP 4, PHP 5)</P
>imagecolorsforindex&nbsp;--&nbsp;取得某索引的颜色</DIV
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>说明</H2
>array <B
CLASS="methodname"
>imagecolorsforindex</B
> ( resource image, int index )<BR
></BR
><P
>&#13;    本函数返回一个具有 red，green，blue 和 alpha
    的键名的关联数组，包含了指定颜色索引的相应的值。
   </P
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>例 1. <B
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>imagecolorsforindex()</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#FF8000">// 打开一幅图像<br /></font><font color="#0000BB">$im </font><font color="#007700">= </font><font color="#0000BB">imagecreatefrompng</font><font color="#007700">(</font><font color="#DD0000">'nexen.png'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// 取得一点的颜色<br /></font><font color="#0000BB">$start_x </font><font color="#007700">= </font><font color="#0000BB">40</font><font color="#007700">;<br /></font><font color="#0000BB">$start_y </font><font color="#007700">= </font><font color="#0000BB">50</font><font color="#007700">;<br /></font><font color="#0000BB">$color_index </font><font color="#007700">= </font><font color="#0000BB">imagecolorat</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">$start_x</font><font color="#007700">, </font><font color="#0000BB">$start_y</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// 使其可读<br /></font><font color="#0000BB">$color_tran </font><font color="#007700">= </font><font color="#0000BB">imagecolorsforindex</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">$color_index</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// 显示该颜色的值<br /></font><font color="#007700">echo </font><font color="#DD0000">'&lt;pre&gt;'</font><font color="#007700">;<br /></font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">$color_tran</font><font color="#007700">);<br />echo </font><font color="#DD0000">'&lt;/pre&gt;'</font><font color="#007700">;<br /><br /></font><font color="#0000BB">?&gt;</font>
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>&#13;      本例将输出：
     </P
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>Array
(
    [red] =&#62; 226
    [green] =&#62; 222
    [blue] =&#62; 252
    [alpha] =&#62; 0
)</PRE
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>&#13;    参见 <A
HREF="function.imagecolorat.html"
><B
CLASS="function"
>imagecolorat()</B
></A
> 和
    <A
HREF="function.imagecolorexact.html"
><B
CLASS="function"
>imagecolorexact()</B
></A
>。
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