[PHP] Obtaining the image size with gd library

[Todd Cary]

I have created a barcode with the gd library and I wish to use it 
directly with PDFLib.  If I write the image to file and then read it in, 
all works well.  However, PDFLib has a Virtual File System.  To use it, 
I need the size of the image in bytes (the file size).  Is there a 
function in the gd library that will give me that?

Todd

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