Protein phosphatase able to dephosphorylate StkP-P and other phosphorylated protein substrates. PhpP and its cognate protein kinase StkP appear to constitute a functional signaling couple in vivo, PhpP's primary role being probably to control phosphorylation levels of StkP and of its targets. PhpP thus performs an essential control of StkP activity (By similarity). H2O + O-phospho-L-seryl-[protein] = L-seryl-[protein] + phosphate H2O + O-phospho-L-threonyl-[protein] = L-threonyl-[protein] + phosphate Binds 2 manganese ions per subunit. Mainly localizes to the midcell division sites. Delocalizes from the septum in the presence of antibiotics that target the latest stages of cell-wall biosynthesis and in cells that have stopped dividing. Overexpression of PhpP leads to a phenotype comparable to cells lacking stkP, with an increased cell length. Belongs to the PP2C family.