(PHP 4, PHP 5, PHP 7, PHP 8)
imagepng — Output a PNG image to either the browser or a file
$image,$file = null,$quality = -1,$filters = -1
Outputs or saves a PNG image from the given
image.
imageA GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
fileThe 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_*
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.
The filters parameter is ignored by system libgd.
Returns true on success or false on failure.
However, if libgd fails to output the image, this function returns true.
Throws a ValueError if quality is invalid.
| Version | Description |
|---|---|
| 8.4.0 |
Now throws a ValueError if quality is invalid.
|
| 8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
<?php
$im = imagecreatefrompng("test.png");
header('Content-Type: image/png');
imagepng($im);
?>