Solve : Dynamic 3 Combo box?

1.	Solve : Dynamic 3 Combo box?
Answer» I make 3 combo box.They combo box name are CATEGORY,sub category,sub sub category. Using PHP,MySQL 3 table in database tbl_category,tbl_subcategory,tbl_sub. 2nd combo box data is DEPEND on 1st combo box data.Like that 3RD combo box data is depend on 2nd combo box data.How can i ?

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