help with image resize

[pmiller624]

ok, what my code does take a image that the user uploaded then takes in and width and height then resizes it.

 

it gets the width and height from the user through textboxes and what is happening is when a user put either zero or nothing into the boxes the image is turned black does anyone know why this is happening.

 

here is what i got

<?php
session_start();
?>
<?php
$filename = $_SESSION['imagename'];
$width = $_SESSION['width'];
$height = $_SESSION['height'];
list($getWidth, $getHeight) = getimagesize("userimages/" . $filename);
if($width > 0){
	$newWidth = $width;
}else{
	$newWidth = $getWidth;
}
if($height > 0){
	$newHeight = $height;
}else{
	$newHeight = $getHeight;
}
$image_p = imagecreatetruecolor($newWidth, $newHeight);
$image = imagecreatefromjpeg("userimages/".$filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
imagejpeg( $image_p, "userimages/".$filename, 100 );
header( 'Location: setup.php' ) ;
?>

[redarrow]

i am guessing here

 

  imagecopyresampled($image_p, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);

 

6 000000 = black

 

so #000000 is black as safe friendly web color.

 

i guess it normal.

 

use a if($what_ever==0){

 

$what_ever=defualt_number;

}

 

to stop the pic being black.

[pmiller624]

thanks for the help but it didnt work