(PHP 4 >= 4.3.0, PHP 5, PHP 7)
imagelayereffect — Set the alpha blending flag to use the bundled libgd layering effects
$image
, int $effect
)Set the alpha blending flag to use the bundled libgd layering effects.
imageAn image resource, 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_OVERLAY
Returns TRUE on success or FALSE on failure.
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:
Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).