How did Philip 2 improve the phalanx?

Philip II of Macedon improved the phalanx by introducing longer spears called sarissas, which were about 18 feet long, allowing soldiers to strike enemies from a greater distance. He also reorganized the formation to include lighter troops, such as skirmishers and cavalry, to support the heavy infantry. This combination enhanced the phalanx's flexibility and striking power, making it more effective in battle. Additionally, he implemented rigorous training and discipline, leading to a more cohesive and battle-ready force.