{
    "minimum-stability": "dev",
    "require": {
        "lciolecki/php-image-optimizer": "dev-master"
    }
}

$optimizer = new \Extlib\ImageOptimizer(array(
    \Extlib\ImageOptimizer::OPTIMIZER_OPTIPNG => '/usr/bin/optipng',  //your_path
    \Extlib\ImageOptimizer::OPTIMIZER_JPEGOPTIM => '/usr/bin/jpegoptim', //your_path
    \Extlib\ImageOptimizer::OPTIMIZER_GIFSICLE => '/usr/bin/gifsicle' //your_path
));

$optimizer->optimize("image.png"); //return true
$optimizer->optimize("image.jpg"); //return true
$optimizer->optimize("image.gif"); //return true
$optimizer->optimize("file.txt"); //return false