使用PHP的GD库中的imagepng()和透明度

问题描述：

在PHP中使用函数imagepng()时，如何确保保存的图像带有透明背景?

When using the function imagepng() in PHP, how can I make sure the images that I save are saved with a transparent background?

答

以下是

Here is an example of the imagecolortransparent function (if it helps):

<?php
// Create a 55x30 image
$im = imagecreatetruecolor(55, 30);
$red = imagecolorallocate($im, 255, 0, 0);
$black = imagecolorallocate($im, 0, 0, 0);

// Make the background transparent
imagecolortransparent($im, $black);

// Draw a red rectangle
imagefilledrectangle($im, 4, 4, 50, 25, $red);

// Save the image
imagepng($im, './imagecolortransparent.png');
imagedestroy($im);
?>

使用PHP的GD库中的imagepng()和透明度

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