Crop rettangolare invece che quadrato

[Pennywise83]

Mi rispondo da solo. Ho trovato questo script che esegue un crop secondo le dimensioni specificate

function create_thumb($nw, $nh, $source, $stype, $dest) {
    $size = getimagesize($source);
    $w = $size[0];
    $h = $size[1];
    switch($stype) {
        case 'gif':
        $simg = imagecreatefromgif($source);
        break;
        case 'jpg':
        $simg = imagecreatefromjpeg($source);
        break;
        case 'png':
        $simg = imagecreatefrompng($source);
        break;
    }
    $dimg = imagecreatetruecolor($nw, $nh);
    $wm = $w/$nw;
    $hm = $h/$nh;
    $h_height = $nh/2;
    $w_height = $nw/2;
    if($wm> $hm) {
        $adjusted_width = $w / $hm;
        $half_width = $adjusted_width / 2;
        $int_width = $half_width - $w_height;
        imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);
    } elseif(($wm <$hm) || ($w == $h)) {
        $adjusted_height = $h / $wm;
        $half_height = $adjusted_height / 2;
        $int_height = $half_height - $h_height;
        imagecopyresampled($dimg,$simg,0,-$int_height,0,0,$nw,$adjusted_height,$w,$h);
    } else {
        imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
    }
    imagejpeg($dimg,$dest,78);
}