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print "££".$unsorted[0]->function."<br>";
@sorted = sort {$unsorted[$a]->function <=> $unsorted[$b]->function} @
+unsorted;

Use of reference "GARD::Book=HASH(0x2b7831c)" as array index at db.pl 
+line 439.
Can't call method "function" on unblessed reference at db.pl line 439.