Question

How to filter out array elements with keys that are negative integers in PHP?

So if I have an array:

Array (
    [-3] => Academic degree
    [-4] => Academic discipline
    [-5] => African American history
    [-6] =>
    [1] => Art
)

the result would be: Array ( [1] => Art ).

My idea was to use something like this:

$arr = array( ‘-1’ => 1, ‘-2’ => 2, ‘3’ => 3,
‘element4’ => 4 ); $filterOutKeys = array( ‘-1’, ‘-2’ );

$filteredArr = array_diff_key( $arr, array_flip( $filterOutKeys ) )

but it turned up as very impractical when dealing with bigger arrays.

Answer 1

Use a simple foreach?

$filteredArr = array();
foreach($arr as $key => $value)
    if($key > 0)
        $filteredArr[$key] = $value;