CODEWITHSUNDEEP
phparraysloopsfor-loopforeach
iprophesy
iprophesy

Reputation: 185

Adding value to array without using loops

I was wondering if it's possible to add a values to an array without using loops.

Yes, I know that technically I can write :

$myArray = array(0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32); //etc...

But as you can see on the example if the line is very long it's smarter to do it with a loop.

Now since I already know that each number will be raised by +2 I was wondering if there is internal php command right of the box so I can do it with a callback or any other magic trick ;)

Not the correct syntax but just so you can get the idea.

$myArray = Array();
$myArray[] = insertArray($valueOf{$x};$x;$x>=100;$x=+2);

Yea, I know that this can also applied as a function/class but I'm asking if I can do that magic RIGHT OF THE BOX :)

Thanks!

Upvotes: 2

Views: 2159

Answers (3)

Styphon
Styphon

Reputation: 10447

You can do this with range() (PHP Manual). To produce your array do:

$array = range(0, 32, 2);

The last variable is the number of steps to make between each entry in the array. It defaults at one but by setting it to 2 each number will increment by 2.

print_r($array);

produces

Array
(
    [0] => 0
    [1] => 2
    [2] => 4
    [3] => 6
    [4] => 8
    [5] => 10
    [6] => 12
    [7] => 14
    [8] => 16
    [9] => 18
    [10] => 20
    [11] => 22
    [12] => 24
    [13] => 26
    [14] => 28
    [15] => 30
    [16] => 32
)

Upvotes: -1

Praveen Kumar Purushothaman
Praveen Kumar Purushothaman

Reputation: 167182

Yes, you have something called array_walk. Define a function like this:

function addTwo (&$item, $key)
{
    $item = $item * 2;
}

Then use the function this way:

array_walk ($myArray, 'addTwo');

In your use case, you can either use range() with the skip option or, you can use this way:

array_walk (range (0, $max));

Or, with range():

range (0, $max, 2);

Upvotes: 2

violator667
violator667

Reputation: 499

You can create an array containing a range of elements using range() it supports skip parameter

$a = range(0,10,2);
print_r($a);

Array
(
    [0] => 0
    [1] => 2
    [2] => 4
    [3] => 6
    [4] => 8
    [5] => 10
)

Upvotes: 5

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