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(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
imagelayereffect — Set the alpha blending flag to use layering effects
Set the alpha blending flag to use layering effects.
image
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
effect
One of the following constants:
IMG_EFFECT_REPLACE
true
to
imagealphablending())
IMG_EFFECT_ALPHABLEND
false
to
imagealphablending())
IMG_EFFECT_NORMAL
IMG_EFFECT_ALPHABLEND
.
IMG_EFFECT_OVERLAY
IMG_EFFECT_MULTIPLY
Version | Description |
---|---|
8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
7.2.0 |
Added IMG_EFFECT_MULTIPLY (requires system libgd >=
2.1.1 or the bundled libgd).
|
Example #1 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: