imagepng

Description
Syntax
Examples
Links

Description

The imagepng of Image for PHP output a PNG image to either the browser or a file.

Syntax

imagepng(
    GdImage $image,
    resource|string|null $file = null,
    int $quality = -1,
    int $filters = -1
): bool

Parameters

image

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

file

The path or an open stream resource (which is automatically closed after this function returns) to save the file to. If not set or null, the raw image stream will be output directly.

Note: null is invalid if the quality and filters arguments are not used.

quality

Compression level: from 0 (no compression) to 9. The default (-1) uses the zlib compression default.

Allows reducing the PNG file size. It is a bitmask field which may be set to any combination of the PNG_FILTER_XXX constants. PNG_NO_FILTER or PNG_ALL_FILTERS may also be used to respectively disable or activate all filters. The default value (-1) disables filtering.

Caution: The filters parameter is ignored by system libgd.

<?

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

$return = imagepng($image);

var_export($return);

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2 · file

<?

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

$file = $_SERVER['DOCUMENT_ROOT'] . '/assets/png/1.png';

$return = imagepng($image, $file);

var_export($return);

true

3 · quality

<?

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

$file = $_SERVER['DOCUMENT_ROOT'] . '/assets/png/1.png';
$quality = 9;

$return = imagepng($image, $file, $quality);

var_export($return);

true

4 · filters

<?

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

$file = $_SERVER['DOCUMENT_ROOT'] . '/assets/png/1.png';
$quality = 9;
$filters = PNG_ALL_FILTERS;

$return = imagepng($image, $file, $quality, $filters);

var_export($return);

true

5 · header

<?

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

header("content-type: image/png");

imagepng($image);

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6 · path

<?

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

$path = "/assets/png/1.png";
$file = $_SERVER['DOCUMENT_ROOT'] . $path;
imagepng($image, $file);

echo '<!doctype html>
<html>
<body>
    <img src="' . $path . '">
</body>
</html>';

<!doctype html>
<html>
<body>
    <img src="/assets/png/1.png">
</body>
</html>

7 · base64

<?

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

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/gAIDAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAANElEQVR4nO3BAQ0AAADCoPdPbQ43oAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAfgx1lAABqFDyOQAAAABJRU5ErkJggg==">
</body>
</html>