Php/docs/function.imagepng
imagepng
(PHP 4, PHP 5, PHP 7)
imagepng — Output a PNG image to either the browser or a file
Description
imagepng
( resource $image
[, mixed $to
= NULL
[, int $quality
= -1
[, int $filters
= -1
]]] ) : bool
Outputs or saves a PNG image from the given
image
.
Parameters
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
to
The path or an open stream resource (which is automatically being closed after this function returns) to save the file to. If not set or
NULL
, the raw image stream will be outputted directly.Note:
NULL
is invalid if thequality
andfilters
arguments are not used.quality
Compression level: from 0 (no compression) to 9. The default (
-1
) uses the zlib compression default. For more information see the » zlib manual.filters
Allows reducing the PNG file size. It is a bitmask field which may be set to any combination of the
PNG_FILTER_XXX
constants.PNG_NO_FILTER
orPNG_ALL_FILTERS
may also be used to respectively disable or activate all filters. The default value (-1
) disables filtering.Caution
The
filters
parameter is ignored by system libgd.
Return Values
Returns TRUE
on success or FALSE
on failure.
Caution
However, if libgd fails to output the image, this function returns TRUE
.
Examples
<?php$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