How do you get phosphate?

A tertiary salt of orthophosphoric acid, as sodium phosphate.

: tiny, salty objects that are mainly made up of phosphoric acids that fertilize and are used in common foods such as bread or other foods.

No. Trisodium phosphate is Na3PO4, but tripotassium phosphate is K3PO4. Potassium (K+) is not the same thing as sodium (Na+), even though both are attached to a phosphate (PO43-) in this example.

A Phosphate is a type of mineral

Basically another name for diammonium hydrogen phosphate is just diammonium phosphate. So by mixing these two similar chemicals together, there would be definitely no chemical reactions.