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imagesetpixel

Description

The imagesetpixel of Image for PHP set a single pixel.

Syntax

imagesetpixel(
    GdImage $image,
    int $x,
    int $y,
    int $color
): bool

Parameters

image

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

x

x-coordinate.

y

y-coordinate.

color

A color identifier created with imagecolorallocate().

Return

Returns true on success or false on failure.

Examples

1 · return

<?

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

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

$x = 0;
$y = 0;

$return = imagesetpixel($image, $x, $y, $color);

var_export($return);

true

2 · base64

<?

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

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

$x = 50;
$y = 50;
imagesetpixel($image, $x, $y, $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/gAIDAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAO0lEQVR4nO3OMQEAAAgDoPUvPUN4eAgJSAAAAAAAAAAAAAAAAAAA4JG21wUAAAAAAAAAAAAAAAAAAHYGZzAC/so5nyEAAAAASUVORK5CYII=">
</body>
</html>

3 · base64 · random

<?

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

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

for($i = 0; $i < 1000; ++$i)
{
    $x = rand(0, $width);
    $y = rand(0, $height);
    imagesetpixel($image, $x, $y, $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,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">
</body>
</html>