How does PHP handle integer indexed non-consecutive keyed arrays?

Question

I'm curious as to how efficient it is in PHP to store an array with integer indices that are non-consecutive.

If I had an array

$b = array();
$b[1] = "Hello";
$b[18] = "World";
$b[999] = "Test";

Are those keys stored, and then hashed to a new array, how does PHP handle this?

Duplicate, see this question

pascal
– pascal

2011-01-28 05:46:13 +00:00
Commented Jan 28, 2011 at 5:46 — pascal
– pascal, Commented Jan 28, 2011 at 5:46

My Other Me · Accepted Answer · 2011-01-28 05:49:07Z

1

From php wep site on array:

An array in PHP is actually an ordered map. A map is a type that associates values to keys. This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. As array values can be other arrays, trees and multidimensional arrays are also possible.

Executing print_r($b); on your code gives the following output:

Array
(
    [1] => Hello
    [18] => World
    [999] => Test
)

answered Jan 28, 2011 at 5:49

My Other Me

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1 Comment

rolinger Over a year ago

I need to create an array like this. I am storing values to mysql record IDs to later be processed. However in my case, the mysql record IDs start at like 100,000 and go up - so an array would be $ar = array([100001] => "Blah", [305278] = "Foo", [412731] = "FooBar") so later I can just reference the array as $ar[$recordID]

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