在PHP中获取相同索引的值

Question

I have 2D array and want to get all values which are at same index say at index '1'. what is the best way to get that as a new array.

Example: we have array(array(1,2,3), array(5,6,7)), the result must be array(2, 6).

Thanks

Answer 1

A simple function would do the trick:

function foobar($array, $index) {
    $result = array();
    foreach($array as $subarray) {
        if(isset($subarray[$index])) {
            $result[] = $subarray[$index];
        }
    } 
    return $result;
}

Or you can just use array_map (requires PHP 5.3):

array_map(function($array) { return $array[1]; }, $input);