Comprara dos arrays y extraer las coincidencias

[jordi45]

<?
$miarray = explode(',',$row_dat['datos']);
$fu[]=$miarray?>
<? } while ($row_dat=mysql_fetch_assoc($dat));?>

He hecho esto:

y sale

array(2) {
[0]=>
string(4) "2222"
[1]=>
string(4) "2231"
}
array(2) {
[0]=>
array(6) {
[0]=>
string(4) "2222"
[1]=>
string(3) "230"
[2]=>
string(3) "500"
[3]=>
string(3) "345"
[4]=>
string(2) "78"
[5]=>
string(2) "
"
}
[1]=>
array(4) {
[0]=>
string(3) "256"
[1]=>
string(2) "78"
[2]=>
string(3) "290"
[3]=>
string(0) ""
}
}
array(0) {
}