(PHP 4 >= 4.3.0, PHP 5, PHP 7)
Set the alpha blending flag to use the bundled libgd layering effects
bool imagelayereffect ( resource $image, int $effect )
Set the alpha blending flag to use the bundled libgd layering effects.
Parameters:
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
effect
One of the following constants:
Returns:
Returns TRUE on success or FALSE on failure.
Notes:
This function requires GD 2.0.1 or later (2.0.28 or later is recommended).
Examples:
imagelayereffect() example
<?php
// Setup an image
$im = imagecreatetruecolor(100, 100);
// Set a background
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im, 220, 220, 220));
// Apply the overlay alpha blending flag
imagelayereffect($im, IMG_EFFECT_OVERLAY);
// Draw two grey ellipses
imagefilledellipse($im, 50, 50, 40, 40, imagecolorallocate($im, 100, 255, 100));
imagefilledellipse($im, 50, 50, 50, 80, imagecolorallocate($im, 100, 100, 255));
imagefilledellipse($im, 50, 50, 80, 50, imagecolorallocate($im, 255, 100, 100));
// Output
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
The above example will output something similar to:
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