I have an array like so:
array(
'a'=>array(
'a'=>3,
'f'=>5,
'sdf'=>0),
't'=>array(
'a'=>1,
'f'=>2,
'sdf'=>5),
'pps'=>array(
'a'=>1,
'f'=>2,
'sdf'=>3)
);
Notice how the sub-arrays are the same for each top-level array. If I wanted to, what's the easiest way to combine the sub-arrays so that I'm left with a one-dimensional array like:
array(
'a'=>5,
'f'=>9,
'sdf'=>8
);
What about this?
$result = array();
foreach ($array as $key => $value) {
foreach ($value as $k => $a) {
if ( ! isset($result[$k])) $result[$k] = 0;
$result[$k] += $a;
}
}
What about two nested foreach and actually creating a new array ?
$input = array(
'a'=>array(
'a'=>3,
'f'=>5,
'sdf'=>0),
't'=>array(
'a'=>1,
'f'=>2,
'sdf'=>5),
'pps'=>array(
'a'=>1,
'f'=>2,
'sdf'=>3)
);
$output = array();
foreach ($input as $v) {
foreach ($v as $k2 => $v2) {
if (!isset ($output[$k2])
$output[$k2] = 0;
$output[$k2] += $v2;
}
}
/* Now $output = array(
'a'=>5,
'f'=>9,
'sdf'=>8
); */
array_walk_recursive($array, function($val, $key) {
global $result;
$result[$key] += $val;
});
