Re: IF or SWITCH

[Robert Cummings <robert@xxxxxxxxxxxxx>]

On Thu, 2006-04-06 at 22:40, Kevin Waterson wrote:
> This one time, at band camp, Robert Cummings <robert@xxxxxxxxxxxxx> wrote:
> 
> > I'm gonna go out on a limb here and say WRONG!
> > 
> > Run yourself a benchmark.
> 
> benchmarks can be hazardous, but lets look at them at their most basic level. By this
> I mean how folks use them every day...
> 
> http://www.phpro.org/benchmarks/if-switch-benchmark.html

Hazardous is right. That's a terrible benchmark. Could have eliminated
hundreds of sources of skew by running the iterations at the command
line. It even does an echos *lol*.

I ran the following as two shell scripts, 10 times each and averaged the
times to get that switch is faster by 0.000000122 secs. Big whup, as I
said in a previous post, that's very likely due to the precomputation
being assigned in userland PHP versus the internal engine. As for which
one is best, that's just flamebait -- right up there with preferred
braces style, tabs or spaces to indent, top post versus bottom post
*teehee*, etc. Personally I prefer if/elseif/else for a moderate number
of conditions or if the conditional expressions are very complex. Switch
I generally use for a large set of constants. They both have readability
pros and cons.

Cheers,
Rob.

<?php

for( $i = 0; $i < 1000000; $i++ )
{
    $foo = 3;
    if( $foo == 1 )
    {
    }
    else
    if( $foo == 2 )
    {
    }
    else
    if( $foo == 3 )
    {
    }
    else
    if( $foo == 4 )
    {
    }
    else
    {
    }
}

?>

<?php

for( $i = 0; $i < 1000000; $i++ )
{
    $foo = 3;
    switch( $foo )
    {
        case 1:
        {
            break;
        }
        case 2:
        {
            break;
        }
        case 3:
        {
            break;
        }
        case 4:
        {
            break;
        }
        default:
        {
        }
    }
}

?>

*Wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee* ;)

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