Remove multiple elements from array and reindex

Question

Can I remove the first three elements and all the remaining ones where value is not equal to 2? The language is php.

print_r($array)

outputs

Array ( 
    [0] => Array ( [name] => aa [value] => 0 )        
    [1] => Array ( [name] => db [value] => 1 ) 
    [2] => Array ( [name] => bc [value] => 2 )
    [3] => Array ( [name] => ba [value] => 3 ) 
    [4] => Array ( [name] => ba [value] => 0 ) 
    [5] => Array ( [name] => bc [value] => 1 )    
    [6] => Array ( [name] => aa [value] => 2 ) 
    [7] => Array ( [name] => cb [value] => 3 )
    [8] => Array ( [name] => ca [value] => 0 ) 
    [9] => Array ( [name] => dc [value] => 1 ) 
    [10] => Array ( [name] => db [value] => 2 )
    [11] => Array ( [name] => aa [value] => 3 )
    [12] => Array ( [name] => dd [value] => 0 )
    [13] => Array ( [name] => db [value] => 1 )
    [14] => Array ( [name] => bb [value] => 2 )
    [15] => Array ( [name] => ac [value] => 3 )
)

I also need to reindex so that it begins from 0

Array ( 
    [0] => Array ( [name] => aa [value] => 2 ) 
    [1] => Array ( [name] => db [value] => 2 )
    [2] => Array ( [name] => bb [value] => 2 )
)

Yes, but you'll have to write some code to do it. Try something and tell us how it goes, and if it doesn't work, then we can help. — Andy Lester
– Andy Lester, Commented Feb 9, 2015 at 19:21
Is it always the first three elements? Or just remove those that don't have a value of 2? — Jason McCreary
– Jason McCreary, Commented Feb 9, 2015 at 19:24
@JasonMcCreary Yes, the first three elements should always be destroyed no matter what, and from the fourth one only those which value is 2 should be kept. — sweet potato
– sweet potato, Commented Feb 9, 2015 at 19:26
@AndyLester. Thanks, I have tried to unset the elements with a foreach loop, but couldn't work it out how to unset more than one element at once. — sweet potato
– sweet potato, Commented Feb 9, 2015 at 19:28

mickmackusa · Accepted Answer · 2020-10-05 01:45:22Z

3

You can do do it this way:

$new_array = array();

foreach ($array as $k => $v) {
    if ($k > 2 && $v['value'] == 2) {
        $new_array[] = $v;
    }
}

print_r($new_array);

edited Oct 5, 2020 at 1:45

mickmackusa♦

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answered Feb 9, 2015 at 19:29

Rudi

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2 Comments

Rudi Over a year ago

That will copy items where $v['value'] is equal to 2. If you want to remove those items (as I understand the question), it's !=

sweet potato Over a year ago

It's the other way around, I want to remove the values which are not equal to 2. I wasn't clear enough. You helped me to understand this really well. If value is buried deeper in parent array, if ($k > 2 and $v['parent'] ['value'] == 2) works as well.

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