Better show than tell.
$first = array(
3=>"Banana",
4=>"Apple",
6=>"Lemon",
7=>"Pineapple",
8=>"Peach"
);
$second = array(4,7,8);
(Please note: the first one is associative array, it can have holes) The result should be
$result = array(
"Apple",
"Pineapple",
"Peach"
);
Any smart idea? Thank you
Here we are using array_intersect_key, array_flip and array_values. This single liner will be enough.
1.
array_valueswill return values of an array.2.
array_flipwill flip array overkeysandvalues.3.
array_intersect_keywill return array on the basis of two input array's over intersecting keys.
print_r(
array_values(
array_intersect_key(
$first, array_flip($second))));
Just a simple foreach loop will do it. And isset() checks that the index exists in the first array before trying to read it:
$first = array(
3=>"Banana",
4=>"Apple",
6=>"Lemon",
7=>"Pineapple",
8=>"Peach"
);
$second = array(4,7,8);
$result = array();
foreach($second as $i)
{
if (isset($first[$i])) $result[] = $first[$i];
}
var_dump($result);
You can use like this
$first = array(
3 => "Banana",
4 => "Apple",
6 => "Lemon",
7 => "Pineapple",
8 => "Peach"
);
$second = array(4, 7, 8);
foreach ($first as $key => $val) {
if (array_search($key, $second) === false) {
unset($first[$key]);
}
}
print_r($first);
exit;
foreachto do the job. And, of course, all this takes less time than posting such a question on Stack Overflow and waiting for others to solve your problems.