php数组中每个键值的最大值

Question

I want to find out the maximum value of the each key in the array

$arr1= array(
    0=>array(1,2,3),
    1=>array(2,4,6),
    2=>array(25,4,5));
}

I want to find the maximum value for each value for the corresponding key The final output shuld be

$max_array = array(25,4,6);

with the below code i get error max(): When only one parameter is given, it must be an array in

foreach ($res_arr as $k=>$subArray) {
    foreach ($subArray as $id=>$value) {
        $spanmaxArray[$id] = max($value);
    }
}

Answer 1

First, rotate array to makes columns as lines

$arr1= array(
    0=>array(1,2,3),
    1=>array(2,4,6),
    2=>array(25,4,5)
);

$arr2 = array();

foreach($arr1 as $subArray) {
    foreach($subArray as $k=>$v) {
        $arr2[$k][] = $v;
    }
}

Then, use array_map as @HamZa did

$max_array  = array_map('max', $arr2);
print_r($max_array);