PHP比较两个数组

Question

Say I have two arrays:

     $a = a,b,c;
     $b = a,b;

When I compare this array output should be c .

Omit the common values in both array.

Answer 1

The quick answer:

array_merge(array_diff($a, $b), array_diff($b, $a));

array-diff($a, $b) will only extract values from $a which are not in $b.

The idea is to merge the differences.

And another way to achieve your goal might be:

function array_unique_merge() {
        return array_unique(call_user_func_array('array_merge', func_get_args()));
    }

Answer 2

Have a look at the PHP array_diff function.

$a = a,b,c;
$b = a,b;
$c = array_diff($a,$b);

Answer 3

Firstly, that's not valid PHP - but...

$a = array("a","b","c");
$b = array("a","b");
print_r(array_diff($a,$b)); // Array ( [2] => c )

Answer 4

Just to make things more straighforward

$a = array("a","b","c");
$b = array("a","b");
$new_array = array_merge(array_diff($a, $b), array_diff($b, $a));
while (list ($key, $val) = each ($new_array)) {
echo $val;
}