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PHP Manual || GD and Image Functions

(PHP 4, PHP 5, PHP 7)

imagepngOutput a PNG image to either the browser or a file

Description

imagepng ( resource $image [, mixed $to = NULL [, int $quality = -1 [, int $filters = -1 ]]] ) : bool

Outputs or saves a PNG image from the given image.

Parameters

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

to

The path or an open stream resource (which is automatically being closed after this function returns) to save the file to. If not set or NULL, the raw image stream will be outputted 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. For more information see the » zlib manual.

filters

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.

Return Values

Returns TRUE on success or FALSE on failure.

Caution

However, if libgd fails to output the image, this function returns TRUE.

Changelog

Version Description
5.4.0 Added support for passing a stream resource to to.
5.1.3 Added the filters parameter.
5.1.2 Added the quality parameter.

Examples

<?php
$im 
imagecreatefrompng("test.png");

header('Content-Type: image/png');

imagepng($im);
imagedestroy($im);
?>

See Also



PHP Manual || GD and Image Functions