PHP uses GD to implement color gradient example_PHP tutorial

An example of how PHP uses GD to implement color gradients

This article describes how PHP uses GD to implement color gradients. Share it with everyone for your reference. The specific implementation method is as follows:

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$im = imagecreate(255, 255); $bg = imagecolorallocate($im, 0, 0, 0); for ($i = 255; $i >= 0; $i--) { $color = imagecolorallocate($im, $i, $i, $i); imagefilledrectangle($im, 0, $i, 255, 1, $color); } header("Content-type: image/png"); imagepng($im); imagedestroy($im); ?>

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$im = imagecreate(255, 255);

$bg = imagecolorallocate($im, 0, 0, 0);

for ($i = 255; $i >= 0; $i--) { $color = imagecolorallocate($im, $i, $i, $i); imagefilledrectangle($im, 0, $i, 255, 1, $color); } header("Content-type: image/png"); imagepng($im); imagedestroy($im); ?>

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