PHP switch语句VS if elseif语句基准

Question

I check this PHP website benchmark for check switch statement VS if else if statement. And I see this result:

Is a there a difference between switch and if structures?. Call 1'000x

• 141 % *if and elseif (using ==)* Total time: 165 µsview code
• 139 % *if, elseif and else (using ==)* Total time: 162 µsview code
• 110 % *if and elseif (using ===)* Total time: 128 µsview code
• 100 % *if, elseif and else (using ===)* Total time: 117 µsview code
• 149 % *switch / caseTotal* time: 174 µsview code
• 181 % *switch / case / default* Total time: 211 µsview code

In result i see if else if is faster (+ **100 %** *if, elseif and else (using ===)* Total time: 117 µsview code).

This benchmark is true and if, elseif and else (using ===) is better and faster as switch statement?!

Answer 1

Whether you get exactly the same results will vary based on what conditions you are evaluating, your equipment, settings, and other factors. But yes, generally if/elseif/else with strict comparison (===) will outperform switch. The reason is that switch uses "loose" (i.e., type-insensitive) comparison (==), which is slower than type-sensitive comparison (===).

Keep in mind that these differences are extremely tiny and are going to be dwarfed by any inefficiencies in your algorithm. So, you should only tune for details like this after you are sure you have eliminated other major bottlenecks.