pngoptim.php

#!/usr/bin/php -Cq
<?php
$dir   = isset($argv[1]) ? $argv[1] : __DIR__;
$skip  = isset($argv[2]) ? intval($argv[2]) : 0;
$count = 0;

if(is_dir($dir)){
    echo "Dir:  {$dir}\n";
    echo "Skip: {$skip} files\n";
    class IgnorantRecursiveDirectoryIterator extends RecursiveDirectoryIterator { 
        public function getChildren() { 
            try { 
                return new IgnorantRecursiveDirectoryIterator($this->getPathname()); 
            } catch(UnexpectedValueException $e) { 
                return new RecursiveArrayIterator(array()); 
            } 
        } 
    }
    $it = new IgnorantRecursiveDirectoryIterator($dir, FilesystemIterator::SKIP_DOTS | FilesystemIterator::UNIX_PATHS);
    $it = new RecursiveIteratorIterator($it, RecursiveIteratorIterator::CHILD_FIRST);
} else {
    echo "File: ", $dir, PHP_EOL;
    $it = new ArrayIterator(array(new SplFileInfo($dir)));
}

$it         = new RegexIterator($it,'/\.png$/i');
$files      = array();
$bytestotal = 0;

foreach($it as $file) { 
    if(++$count > $skip){//$it->seek($skip);
        $files[$count] = $file->getPathname();
        $bytestotal   += $file->getSize();
    }
}

echo "Files to optimize: ", ($count-$skip),"/{$count} (".($bytestotal/1024)."KiB)\n";
echo str_repeat('=',42),"\n";

foreach($files as $i => $filepath) {
    echo "{$i}/{$count}: {$filepath}\n";
    echo str_repeat('+',30),"\n";
    $arg = escapeshellarg($filepath);
    $fp  = popen("optipng -o7 {$arg}", "r"); while(!feof($fp)) echo fgets($fp); fclose($fp); 
    $fp  = popen("pngout {$arg}", "r");      while(!feof($fp)) echo fgets($fp); fclose($fp); 
}

sleep(3);//deffered saving?
clearstatcache();
foreach($files as $filepath)
    $bytestotal -= filesize($filepath);

echo str_repeat('=',42),"\n";
echo "Space freed on ", count($files), " files (".($bytestotal/1024)."KiB)\n";