This document discusses PHP control structures including if/else statements, switch statements, and looping structures like while, do-while and for loops.
If/else statements allow for conditional execution of code based on simple or compound expressions. Switch statements allow checking a variable against multiple case values.
While and do-while loops check a condition at the start or end of each loop iteration. For loops allow iterating with a counter variable through initialization, condition checking, and increment/decrement each loop.