Problème d'accès aux attributs de ma classe

echo "<pre>".print_r($css, true)."</pre>";

echo "<pre>".print_r ($css)."</pre>";

Styles Object
(
    [_aactivecolor:private] => 5
    [_acolor:private] => 5
    [_ahovercolor:private] => 5
    [_avisitedcolor:private] => 5
    [_backgroundcolor:private] => 
    [_backgroundimage:private] => 
    [_backgroundleft:private] => 
    [_backgroundtop:private] => l
    [_borderbottomcolor:private] => 5
    [_borderbottomtype:private] => 
    [_borderbottomwidth:private] => c
    [_borderleftcolor:private] => 5
    [_borderlefttype:private] => 
    [_borderleftwidth:private] => d
    [_borderrightcolor:private] => 5
    [_borderrighttype:private] => 
    [_borderrightwidth:private] => b
    [_bordertopcolor:private] => 5
    [_bordertoptype:private] => 
    [_bordertopwidth:private] => a
    [_boxshadowblur:private] => g
    [_boxshadowcolor:private] => 3
    [_boxshadowright:private] => f
    [_boxshadowtop:private] => e
    [_color:private] => 4
    [_elem1width:private] => 
    [_elem2width:private] => 
    [_fontfamily:private] => 0
    [_fontgroup:private] => 
    [_fontsize:private] => 90%
    [_formbordercolor:private] => 
    [_formborderstyle:private] => 
    [_formborderwidth:private] => 
    [_formcolor:private] => 
    [_formpadding:private] => 
    [_formwidth:private] => 
    [_h1color:private] => 5
    [_h1font:private] => 
    [_h1margin:private] => Array
    [_h1marginbot:private] => 
    [_h1margintop:private] => 
    [_h1size:private] => y
    [_h1weight:private] => v
    [_h2color] => 5
    [_h2margin:private] => Array
    [_h2marginbot:private] => 
    [_h2margintop:private] => 
    [_h2size] => z
    [_h2weight:private] => w
    [_h3color:private] => 
    [_h3font:private] => 5
    [_h3margin:private] => Array
    [_h3marginbot:private] => 
    [_h3size:private] => a
    [_h3weight:private] => x
    [_height:private] => b
    [_id:private] => 
    [_imgbordcolor:private] => 2
    [_imgbordround:private] => s
    [_imgbordwidth:private] => r
    [_imgkeyword:private] => t
    [_imgmaxheight:private] => p
    [_imgmaxwidth:private] => n
    [_imgminheight:private] => q
    [_imgminwidth:private] => o
    [_imgwidth:private] => m
    [_input1padding:private] => 
    [_input1round:private] => 
    [_input2padding:private] => 
    [_input2round:private] => 
    [_input3padding:private] => 
    [_input3round:private] => 
    [_inputbordercolor:private] => 0
    [_inputborderwidth:private] => j
    [_inputfontsize:private] => 
    [_inputheight:private] => i
    [_inputmarginright:private] => 
    [_inputsubmit1bgcolor:private] => 
    [_inputsubmit1bordercolor:private] => 3
    [_inputsubmit1borderwidth:private] => v
    [_inputsubmit1color:private] => 
    [_inputsubmit1height] => u
    [_inputsubmit1padding:private] => 
    [_inputsubmit1round:private] => 
    [_inputsubmit1width] => t
    [_inputsubmit2bgcolor:private] => 
    [_inputsubmit2bordercolor:private] => 2
    [_inputsubmit2borderwidth:private] => y
    [_inputsubmit2color:private] => 
    [_inputsubmit2height] => x
    [_inputsubmit2padding:private] => 
    [_inputsubmit2round:private] => 
    [_inputsubmit2width] => w
    [_inputsubmit3bgcolor:private] => 
    [_inputsubmit3bordercolor:private] => 5
    [_inputsubmit3borderwidth:private] => b
    [_inputsubmit3color:private] => 
    [_inputsubmit3height] => a
    [_inputsubmit3padding:private] => 
    [_inputsubmit3round:private] => 
    [_inputsubmit3width] => z
    [_inputsubmitfontsize:private] => 
    [_inputsubmitmarginright:private] => 
    [_inputwidth:private] => h
    [_labelbordercolor:private] => 2
    [_labelborderwidth:private] => p
    [_labelfontsize:private] => 
    [_labelheight:private] => o
    [_labelwidth:private] => n
    [_lineheight:private] => u
    [_marginbottom:private] => i
    [_marginleft:private] => j
    [_marginright:private] => h
    [_margintop:private] => g
    [_paddingbottom:private] => e
    [_paddingleft:private] => f
    [_paddingright:private] => d
    [_paddingtop:private] => c
    [_palette:private] => 69
    [_place:private] => 
    [_posbot:private] => 
    [_posleft:private] => 
    [_posright:private] => 
    [_postop:private] => 
    [_selectbordercolor:private] => 1
    [_selectborderwidth:private] => m
    [_selectheight:private] => l
    [_selectwidth:private] => k
    [_textareabordercolor:private] => 0
    [_textareaborderwidth:private] => 
    [_textareaheight:private] => r
    [_textareaweight:private] => 
    [_textareawidth:private] => q
    [_textdecoration:private] => none
    [_textdecorationa:private] => a:
    [_textdecorationaactive] => act
    [_textdecorationahover] => hov
    [_textdecorationavisited:private] => vis
    [_typforms:private] => 
    [_weight:private] => 
    [_width:private] => a
)

var_dump(get_object_vars($css));

array(10) { ["_textdecorationaactive"]=> string(3) "act" ["_textdecorationahover"]=> string(3) "hov" ["_h2size"]=> string(1) "z" ["_inputsubmit1width"]=> string(1) "t" ["_inputsubmit1height"]=> string(1) "u" ["_inputsubmit2width"]=> string(1) "w" ["_inputsubmit2height"]=> string(1) "x" ["_inputsubmit3width"]=> string(1) "z" ["_inputsubmit3height"]=> string(1) "a" ["_h2color"]=> string(1) "5" }