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imagealphablending

Description

The imagealphablending of Image for PHP set the blending mode for an image.

Syntax

imagealphablending(
    GdImage $image,
    bool $enable
): bool

Parameters

image

A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().

enable

Whether to enable the blending mode or not. On true color images the default value is true otherwise the default value is false.

Return

Returns true on success or false on failure.

Examples

1 · return

<?

$width = 100;
$height = 100;
$image = imagecreate($width, $height);

$enable = true;

$return = imagealphablending($image, $enable);
    
var_export($return);

true

2 · base64 · imagecreate · enable · false

<?

$width = 100;
$height = 100;
$image = imagecreate($width, $height);

$enable = false;
imagealphablending($image, $enable);

$red = 0;
$green = 0;
$blue = 0;
$background = imagecolorallocate($image, $red, $green, $blue);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';

true

3 · base64 · imagecreate · enable · true

<?

$width = 100;
$height = 100;
$image = imagecreate($width, $height);

$enable = true;
imagealphablending($image, $enable);

$red = 0;
$green = 0;
$blue = 0;
$background = imagecolorallocate($image, $red, $green, $blue);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';

true

4 · base64 · imagecreatetruecolor · enable · false

<?

$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$enable = false;
imagealphablending($image, $enable);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA+UlEQVR4nO3csQ2AMBAEQYzov2UIEAWs9JGZKeCClTPLXvexvzW0cw7t/IJYgViBWIFYgViBWIFYgViBWIFYgViBWIFYgViBWIFYgViBWIFYgViBWIFYgVjBNbi1js1vbJ2sQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxg6tvhl2e/fMQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKxArECsQKHkkmA8i9Q95eAAAAAElFTkSuQmCC">
</body>
</html>

5 · base64 · imagecreatetruecolor · enable · true

<?

$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$enable = true;
imagealphablending($image, $enable);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';

true