How can PHP be used to compress PNG files without losing transparency?

To compress PNG files without losing transparency in PHP, you can use the `imagepng()` function with the `compression` parameter set to a value between 0 and 9. A higher compression value will result in a smaller file size but may reduce image quality. Additionally, you can use tools like PNGQuant or OptiPNG to further optimize the compressed PNG files. 

$source = imagecreatefrompng('input.png');
imagepng($source, 'output.png', 9); // Compression value can be adjusted between 0 and 9
imagedestroy($source);

Keywords

PHP compression PNG transparency lossless

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