PHP imagejpeg() problems

I had an image upload script that worked on my little shared hosting, but just as I switched to Virt Ded, it immediately stopped working. After some research I determined the culprit to be the PHP function imagejpeg() - which was the last bit of code in the script.

It allows me to specify null as the filepath (in开发者_运维问答 which case it prints it to the screen), but does not allow me to enter ANY filepath without return false.

Anybody know what is going on?

First I would see if the PHP install contains all the libgd stuff you need for imagejpeg().

You can check like this:

$extensions = get_loaded_extensions();

if( !in_array( 'gd', $extensions ) )
{
  die "libgd is not loaded";
}

If that's good to go you can do something like:

$gd = gd_info();

while( list( $k, $v ) = each( $gd ) )
{
  echo "$k: $v";
}

Make sure you see some jpeg stuff listed, if there is none you need some dependent libraries installed.