l'ho fatto. mi stampa:

array(10) { ["GD Version"]=> string(15) "1.6.2 or higher" ["FreeType Support"]=> bool(true) ["FreeType Linkage"]=> string(16) "with TTF library" ["T1Lib Support"]=> bool(false) ["GIF Read Support"]=> bool(false) ["GIF Create Support"]=> bool(false) ["JPG Support"]=> bool(true) ["PNG Support"]=> bool(true) ["WBMP Support"]=> bool(true) ["XBM Support"]=> bool(false) }