Resize image

[licoszen]

Salve ragazzi! Ho un problemino con uno script:

<?php

if(isset($_POST['Submit']))

{
    $size = 150; // the thumbnail height

    $filedir = 'pics/'; // the directory for the original image
    $thumbdir = 'pics/'; // the directory for the thumbnail image
    $prefix = 'small_'; // the prefix to be added to the original name
    $temp = time();

    $maxfile = '2000000';
    $mode = '0666';
    
    $userfile_name = $_FILES['image']['name'];
    $userfile_tmp = $_FILES['image']['tmp_name'];
    $userfile_size = $_FILES['image']['size'];
    $userfile_type = $_FILES['image']['type'];
    
    if (isset($_FILES['image']['name'])) 
    {
        $prod_img = $filedir.$temp.$userfile_name;

        $prod_img_thumb = $thumbdir.$prefix.$temp.$userfile_name;
        move_uploaded_file($userfile_tmp, $prod_img);
        chmod ($prod_img, octdec($mode));
        
        $sizes = getimagesize($prod_img);

        $aspect_ratio = $sizes[1]/$sizes[0]; 

        if ($sizes[1] <= $size)
        {
            $new_width = $sizes[0];
            $new_height = $sizes[1];
        }else{
            $new_height = $size;
            $new_width = abs($new_height/$aspect_ratio);
        }

        $destimg=ImageCreateTrueColor($new_width,$new_height)
            or die('Problem In Creating image');
        $srcimg=ImageCreateFromJPEG($prod_img)
            or die('Problem In opening Source Image');
        if(function_exists('imagecopyresampled'))
        {
            imagecopyresampled($destimg,$srcimg,0,0,0,0,$new_width,$new_height,ImageSX($srcimg),ImageSY($srcimg))
            or die('Problem In resizing');
        }else{
            Imagecopyresized($destimg,$srcimg,0,0,0,0,$new_width,$new_height,ImageSX($srcimg),ImageSY($srcimg))
            or die('Problem In resizing');
        }
        ImageJPEG($destimg,$prod_img_thumb,90)
            or die('Problem In saving');
        imagedestroy($destimg);
    }

    echo '
    <a href="'.$prod_img.'">
        [img]'.$prod_img_thumb.'[/img]
    </a>';

}else{

    echo '
    <form method="POST" action="'.$_SERVER['PHP_SELF'].'" enctype="multipart/form-data">
    <input type="file" name="image">


    <input type="Submit" name="Submit" value="Submit">
    </form>';
}

?>

Funziona perfettamente l'unico mio desiderio e che vorrei avere la larghezza fissa e non l'altezza, è possibile?

Grazie ragazzi a presto! ( ah se mi spiegate anche il ragionamento perché io ho ci provato per parecchio tempo, ma nulla!