Updating Values in An Array

Question

I am trying to update the reviewCount on each array to 1. I am confused why my foreach loop will not update it. Any help would be greatly appreciated

$output:

Array(
    [1] => Array(
        [category] => Category 1
        [country] => USA
        [date] => 2012-04-07 23:50:49
        [name] => Product 1
        [reviewCount] => 
    )
    [2] => Array(
        [category] => Category 1
        [country] => USA
        [date] => 2012-04-07 23:50:49
        [name] => Product 1
        [reviewCount] => 
)

Code:

foreach ($output as $row) {
    $row['reviewCount'] = 1;
}

Jon · Accepted Answer · 2012-04-25 09:09:33Z

3

It does not update it inside $output because you are setting the review count on a copy of the row. Do this instead:

foreach ($output as &$row) { // <-- added &
    $row['reviewCount'] = 1;
}

This way you are operating on a reference to the row, which has the same effect of operating on the original row itself. See this page for more details.

Another way to do the same (more intuitive possibly, although "worse" technically) would be

foreach ($output as $key => $row) {
    $output[$key]['reviewCount'] = 1;
}

This way you are operating on the original row again -- obviously, since you are fetching it from inside the array manually using its key.

answered Apr 25, 2012 at 9:09

Jon

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2 Comments

Andreas Wong Over a year ago

I'm interested, how is it "worse"? Could you please elaborate? :)

Jon Over a year ago

@NiftyDude: It performs one more lookup. Not much of a problem, so quotes around worse.

Andreas Wong · Accepted Answer · 2012-04-25 09:11:00Z

0

Alternative way that doesn't use reference: (&)

foreach($output as $i => $row) {
   $output[$i]['reviewCount'] = 1;
}

answered Apr 25, 2012 at 9:11

Andreas Wong

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