php session_start();for($i=0;$i$_nmsg.= dechex(mt_rand(0,15));}$_session['code']=$_nmsg;$_width=75;$_height=25;$_img=imagecreatetruecolor($_width,$_height);$_white=imagecolorallocate($_img,255,255,255);imagefill($_img,0,0,$_white);header('content-type:image/png');imagepng($_img);imagedestroy($_img);?>
用php生成一张图片，但是显示不出来
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