imagepng
(PHP 4, PHP 5, PHP 7, PHP 8)
imagepng — Output a PNG image to either the browser or a file
Description
GdImage
$image,resource|string|null
$file = null,int
$quality = -1,int
$filters = -1): bool
Outputs or saves a PNG image from the given
image.
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:
nullis invalid if thequalityandfiltersarguments 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_XXXconstants.PNG_NO_FILTERorPNG_ALL_FILTERSmay also be used to respectively disable or activate all filters. The default value (-1) disables filtering.CautionThe
filtersparameter is ignored by system libgd.
Return Values
Returns true on success or false on failure.
However, if libgd fails to output the image, this function returns true.
Changelog
| Version | Description |
|---|---|
| 8.0.0 |
image expects a GdImage
instance now; previously, a resource was expected.
|
Examples
<?php
$im = imagecreatefrompng("test.png");
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>
See Also
- imagegif() - Output image to browser or file
- imagewbmp() - Output image to browser or file
- imagejpeg() - Output image to browser or file
- imagetypes() - Return the image types supported by this PHP build
- imagesavealpha() - Whether to retain full alpha channel information when saving PNG images
