Appending subarray of multidimensional array to PHP associative array

Question

How can portions of multidimensional arrays be added to an existing two-dimensional (associative) array?

For example, for an existing associative array with the following elements:

$builder = array();
$builder['builder_id'] =        $source['id'];
$builder['builder_name'] =      $source['name'];
$builder['builder_address'] =   $source['address'];

how can portions of the following multidimensional array:

$selection[$category['category_name']]['item_name'] = $category_general['item_name'];
$selection[$category['category_name']]['item_source'] = $category_general['item_source'];
$selection[$category['category_name']]['item_image'] = $category_general['item_image'];

be appended to create the following structure:

$builder['builder_id']
$builder['builder_name']
$builder['builder_address']
$builder['category_name']
$builder['category_name']['item_name']
$builder['category_name']['item_source']
$builder['category_name']['item_image']

Assignments like this didn't work:

$builder['category_name'] = $selection[$category['category_name']];
$builder['category_name'] = $selection[$category['category_name']][];

Any suggestions?

Thanks!

edit:
@symcbean you are correct. assignment failed due to null element in array being assigned.
@Snowsickle thanks for tip which identified source of problem noted.

can you clarify the difference between nested and multidimensional arrays? — pseudonymo
– pseudonymo, Commented Aug 17, 2012 at 20:57
Is google down again? Try stackoverflow.com/questions/11177615/… for starters — symcbean
– symcbean, Commented Aug 20, 2012 at 8:37

Alex Kalicki · Accepted Answer · 2012-08-15 21:08:42Z

2

The first assignment should work.

$builder['category_name'] = $selection[$category['category_name']];

will assign all values contained in the array $selection[$category['category_name']] to the array $builder['category_name'].

DEMO

answered Aug 15, 2012 at 21:08

Alex Kalicki

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3 Comments

pseudonymo Over a year ago

PHP Error received when using this assignment method: A PHP Error was encountered Severity: Notice Message: Undefined index: Residential & Commercial Filename: controllers/cron.php Line Number: 238

symcbean Over a year ago

Snowsickle is correct. If you get that error then the assignment you've shown in the second block of code in your question will fail too - and it the reason it fails is due to the contents of the $category array - not the method for combining the arrays.

Alex Kalicki Over a year ago

@pseudo, please so a var_dump() of both the $selection and $builder arrays and edit your question with the result.

trevorkavanaugh · Accepted Answer · 2012-08-15 21:06:55Z

0

The assignment should work.. but if you need an alternative method:

foreach($selection[$category['category_name']] as $key => $value)
{
    $builder['category_name'][$key] = $value;
}

But once again, assignment with arrays has always worked for me.

answered Aug 15, 2012 at 21:06

trevorkavanaugh

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