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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>