Matlab shared a common legend

     figure;
     lgd = []; 
     phf = [];
   
     ph = cell(3,1)
     subplot(2,2,1);
     ph{1} = plot(rand(10,2),'s-');
     phf = [phf; ph'];
     lgd = [lgd,{['1']}]; 
     hold on;
     ph{2} = plot(rand(10,3),'x-')
     phf = [phf; ph'];
     lgd = [lgd,{['2']}];
     subplot(2,2,3:4);
     ph{3}=plot(rand(10,3),'o-');
     phf = [phf; ph'];
     lgd = [lgd,{['3']}];

   
     sh=subplot(2,2,2);
     p=get(sh,'position');
     lh=legend(sh,[ph{1,1};ph{2,1};ph{3,1}],lgd );
     set(lh,'position',p);
     axis(sh,'off');