CODEWITHSUNDEEP
php
Mbrouwer88
Mbrouwer88

Reputation: 2282

What usage of if's is faster?

I am quite new to PHP, and I have a question about IF statements.

Example 1:

<?php
if($a == 1){
  if($b == 1){
    echo 'test';
  }
}
?>

Example 2:

<?php
if($a == 1 && $b ==1){
  echo 'test';
}
?>

Both have the same result, but which one is faster? Does it even matter?

Upvotes: 2

Views: 128

Answers (6)

Baba
Baba

Reputation: 95103

This is Premature Optimization & Micro Benchmark , you really need to read Don't be STUPID: GRASP SOLID! to understand why i said so

But if you want to know if($a == 1 && $b ==1) seems faster is most PHP versions

See Benchmark

If you want to know the real difference then look at the opcodes

First Code :

line     # *  op                           fetch          ext  return  operands
---------------------------------------------------------------------------------
   2     0  >   IS_EQUAL                                         ~0      !0, 1
         1    > JMPZ                                                     ~0, ->7
   3     2  >   IS_EQUAL                                         ~1      !1, 1
         3    > JMPZ                                                     ~1, ->6
   4     4  >   ECHO                                                     'test'
   5     5    > JMP                                                      ->6
   6     6  > > JMP                                                      ->7
         7  > > RETURN                                                   1

Secound Code 

line     # *  op                           fetch          ext  return  operands
---------------------------------------------------------------------------------
   2     0  >   IS_EQUAL                                         ~0      !0, 1
         1    > JMPZ_EX                                          ~0      ~0, ->4
         2  >   IS_EQUAL                                         ~1      !1, 1
         3      BOOL                                             ~0      ~1
         4  > > JMPZ                                                     ~0, ->7
   3     5  >   ECHO                                                     'test'
   4     6    > JMP                                                      ->7
         7  > > RETURN                                                   1

Can you see how similar with very minimal difference. And that is why it does not make sense to worry about this light this but write good and readable code.

Upvotes: 5

h2ooooooo
h2ooooooo

Reputation: 39522

Preoptimization is the root to all evil.

That said, your first piece of code is a tiny bit faster (but again, minimally - don't bother to change your code to this - readability is way more important than the tiny speed incremention you get from changing your conditions.

3,000,000 iterations of the first piece of code: ~ 0.9861679077 seconds
3,000,000 iterations of the second piece of code: ~ 1.0684559345 seconds

Difference: ~ 0.0822880268 seconds
Difference per iteration: ~ 0.0000000274 seconds (or 274 nano seconds).

Upvotes: 1

Robert
Robert

Reputation: 20286

Both are the same. There are not much code to be optimized you can even write to make shorter syntax.

<?php
echo $a && b ? 'test' : '';
?>

Does the same.

I've modified a bit Baba's benchmark to check the results for shorthand syntax.

Results

Upvotes: 1

dino.keco
dino.keco

Reputation: 1401

Both are same, because PHP interpreter is "smart enough" to figure out that.

Upvotes: 0

Alberto Zaccagni
Alberto Zaccagni

Reputation: 31550

No, it does not matter. Such little performance tweaks are usually overcome by the running environment. Such as inefficient algorithms or client side best practices being ignored.

Upvotes: 0

Ziarno
Ziarno

Reputation: 7552

They are the same - in both cases if the first condition is false, the second will not be tested.

Upvotes: 1

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