PHP array_filter - How to array_filter arrays using multiple keys in the callback function?

Question

  array(  
    [n] => array(

       [mother]   => 'some_name',
       [children] =>  [n] => array(
                               ['child_name']=>'some_name'
                               ...
                             )

         )
   )

I would like to filter this array using the array_filter(). To filter that array to get only the "records" where the mothers are named "Jane" for instance I do the following which is working like a charm.

array_filter($myarray, function ($k) { 
   return $k['mother'] == 'Jane'; 
});

Now I would like to filter $myarray to get the "records" where the children are named "Peter". I tried the following which is not working.

array_filter($myarray, function ($k) { 
    return $k['children']$k['child_name'] == 'Peter'; 
});

I also tried the following which is not working either.

array_filter($myarray, function ($k1,$k2) { 
    return $k1['children']$k2['child_name'] == 'Peter'; 
});

array([child_name] => ...) is invalid syntax. What does the array actually look like? — deceze
– deceze ♦, Commented Feb 24, 2014 at 16:21
I redited myarray so you can better see how it is composed... — Marc
– Marc, Commented Feb 24, 2014 at 16:29
I don;t know that array_filter is what you are looking for here since you are needing to use both a key and a value. You may have a look at array_walk() or array_walk_recursive(), or simply just build your own looping logic in a function. it is also not clear what you want to happen when the key/value is found in child array. Should that child array itself be filtered? — Mike Brant
– Mike Brant, Commented Feb 24, 2014 at 16:59

kafsoksilo · Accepted Answer · 2014-02-24 16:40:23Z

3

You have an error inside the array filter callback function:

$myarray = array(
    array(
       'mother'   => 'Jane',
       'children' =>  array(
            array('child_name' => 'Peter'),
            array('child_name' => 'Peter2')
        )
    ),

    array(
       'mother'   => 'Jane1',
       'children' =>  array(
            array('child_name' => 'Peter1'),
        )
    )
);

//The filtering
$myarray = array_filter($myarray, function ($k) {

    //Loop through childs
    foreach ($k['children'] AS $child)
    {
        //Check if there is at least one child with the required name 
        if ($child['child_name'] === 'Peter')
            return true;
     }

    return false;
});

print_r($myarray);

edited Feb 24, 2014 at 16:40

answered Feb 24, 2014 at 16:35

kafsoksilo

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1 Comment

Marc Over a year ago

Hello. Already tried not working because [children] is an array. The are usually multiple children. So the question is how to use multiple keys in the callback function?

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