<?php
header("Content-type: image/png");

$im = @imagecreatetruecolor(200, 200);
$red = imagecolorallocate($im, 255, 0, 0);

//用 $red 颜色填充图像
imagefill( $im, 0, 0, $red );

imagepng($im);
imagedestroy($im);
?>

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