(PHP 4, PHP 5, PHP 7)
imagecolorsforindex — 取锟斤拷某锟斤拷锟斤拷锟斤拷锟斤拷色
$image
, int $index
) : array锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷 red锟斤拷green锟斤拷blue 锟斤拷 alpha 锟侥硷拷锟斤拷锟侥癸拷锟斤拷锟斤拷锟介，锟斤拷锟斤拷锟斤拷指锟斤拷锟斤拷色锟斤拷锟斤拷锟斤拷锟斤拷应锟斤拷值锟斤拷
Example #1 imagecolorsforindex() 锟斤拷锟斤拷
<?php
// 锟斤拷一锟斤拷图锟斤拷
$im = imagecreatefrompng('nexen.png');
// 取锟斤拷一锟斤拷锟斤拷锟缴�
$start_x = 40;
$start_y = 50;
$color_index = imagecolorat($im, $start_x, $start_y);
// 使锟斤拷啥锟�
$color_tran = imagecolorsforindex($im, $color_index);
// 锟斤拷示锟斤拷锟斤拷色锟斤拷值
echo '<pre>';
print_r($color_tran);
echo '</pre>';
?>
锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟�
Array
(
[red] => 226
[green] => 222
[blue] => 252
[alpha] => 0
)
锟轿硷拷 imagecolorat() 锟斤拷 imagecolorexact()锟斤拷