PHP switch statement VS if elseif statement benchmark

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?!

Its no surprise that === is faster than == since == tries to make a type conversion if the two values are not equal. The switch-case-statement had only 2 cases (and a default case). I think it gets faster (relative to if-elseif) if you have more cases. But what exactly is your question? — AbcAeffchen
– AbcAeffchen, Commented Jul 19, 2015 at 11:30
Benchmark flaw: is the first case/if more common or less common than the last? — Rick James
– Rick James, Commented Jul 25, 2015 at 17:26

elixenide · Accepted Answer · 2015-07-25 17:28:07Z

3

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.

edited Jul 25, 2015 at 17:28

answered Jul 19, 2015 at 11:26

elixenide

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Community · Accepted Answer · 2017-05-23 10:24:20Z

1

Default PHP switch is not with exact match.

Some examples for exact match switch.

edited May 23, 2017 at 10:24

CommunityBot

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answered Jul 19, 2015 at 18:47

koredalin

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