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Posted by Ken Robinson on 01/03/06 18:51
Gerard Matthew wrote (in part):
> I'm looking for a short way of suming the indexes of two arrays and
> returning one array as the result. I'm not referring to what
> array_sum() is capable of doing. Below will get it done; but is there
> any built in function doing the same??
>
> function sum_by_index($array1,$array2) {
> for ($i = 0; $i <= (count($array1) -1); $i++) {
> $temp[$i] = $array1[$i] + $array2[$i];
> }
>
> return $temp;
> }//note both $array1 and $array2 are to be of the same size
The following function does the same as yours with the added
functionality that it works with associative arrays also:
function sum_by_index($ary1,$ary2)
{
$tmp = array();
foreach($ary1 as $k=>$v) $tmp[$k] = $v + $ary2[$k];
return($tmp);
}
In your function, why do you use
for ($i = 0; $i <= (count($array1) -1); $i++)
when
for ($i = 0; $i < count($array1); $i++)
works just as well (and almost everyone else uses it).
Ken
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