(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.
imageA GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
effectOne of the following constants:
IMG_EFFECT_REPLACEtrue to
imagealphablending())
IMG_EFFECT_ALPHABLENDfalse to
imagealphablending())
IMG_EFFECT_NORMALIMG_EFFECT_ALPHABLEND.
IMG_EFFECT_OVERLAYIMG_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);
?>The above example will output something similar to: