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I have associative array (dynamic-may have more arrays but same keys):

  Array
 (
  [food] => Array
    (
        [0] => 3
        [1] => 4
        [2] => 1
    )

[liquor] => Array
    (
        [0] => 4
        [1] => 5
        [2] => 0
    )

[beer] => Array
    (
        [0] => 5
        [1] => 6
        [2] => 0
    )

)

I need to use array_sum on each array so result would be:

Array ( [food] => 8, [liquor] => 9, [beer] => 11 )

Thanks!

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1 Answer

up vote 5 down vote accepted 
$result = array_map('array_sum', $your_array);

Example: http://ideone.com/LqTAV

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array_sum needs to be quoted, don't rely on an undefined constant mapping to a string (+1 for the right idea though). – alex Sep 29 '11 at 23:48
I get error too: Notice: Use of undefined constant array_sum - assumed 'array_sum' But array_map - good to know. – phpJs Sep 29 '11 at 23:52
@hakre - I preferred to just fix it to be quoted after alex's expanded comment; kindly stop futzing with the answer. >.< – Amber Sep 29 '11 at 23:52
us.php.net/array_map - function signature has a $callback as the first parameter. See us.php.net/manual/en/… -- "A PHP function is passed by its name as a string." In most environments, leaving it unquoted won't be a problem, but for maximum compatibility, quoting is correct. – artlung Sep 29 '11 at 23:58
@artlung: I'd argue it's never a good idea to pass it unquoted. – alex Sep 30 '11 at 0:01
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