Compress PNG files in PHP
I am creating a PNG file with a Cairo PHP extension. The image contains background and text. Now I want to compress these images using PHP after cairo has generated it. Is there a library for this?
I found the pngcrush tool. But this is a command line tool. I do not want to make a challenge system
. If there is no PHP solution, the C solution will do. In this case, I'll make a PHP extension.
I have read this related question. But there is no answer to that.
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I would look at PngOptimizer . You can get the source for it at the bottom of the page, and also have a separate CLI version.
The only problem is that the source is C ++ and not ANSI C. I've never done a PHP extension, so I don't know if that matters.
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You can use imagepng () ...
//If you don't already have a handle to the image and it just on the file system...
$im = imagecreatefrompng("yourGenerateFile.png");
$quality = 5; //0 - 9 (0= no compression, 9 = high compression)
imagepng($im, 'file/to/save.png', $quality); //leave out filename if you want it to output to the buffer
imagedestroy($im);
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