Optimising array creation

[James_43]

Hi all,

In PHP just wondering if anyone knows whether one method of creating multiple indexes within an array is more efficient / preferable to another?

`

$listing['one'] = $x;
$listing['two'] = $y;
$listing['three'] = $z;

`

or:

    $listing = [
                    ['one'] => $x,
                    ['two'] => $y,
                    ['three'] => $z
                ];

Most of the time I unthinkingly do the former, but it occured to me that it's quite possible the latter is more efficient.

Any thoughts?

[rproffitt]

I'd read http://php.net/manual/en/features.gc.performance-considerations.php and try it both ways. Be sure to add the echo memory_get_peak_usage(), "\n"; at the end to see if it mattered.

[paulkd]

Hi James,

I think your second listing should actually be coded:-

$listing = [
    'one' => $x,
    'two' => $y,
    'three' => $z
];

[James_43]

So according to the test I just ran (and I'm completely unfamilair with memoery testing so for all I know my method was just pointless). But it seems there is definitely an improvement in using the latter method.

Calling the variable multiple times = 349616

Calling the variable once = 348600