求高效算法找
$a = array(
'a' => array(1,2,3,4,5,6),
'b' => array(1,7,8,9),
'c' => array(1,6,7,8,9),
)
$b = array(
'2','4'
)
求高效算法找出 $b数组 属于数组 $a a、b、c的那一项的子集，注 $a,$b 数量不确定
------解决方案--------------------
$a = array(
'a' => array(1,2,3,4,5,6),
'b' => array(1,7,8,9),
'c' => array(1,6,7,8,9),
);
$b = array(
'2','4'
);
$r = array_filter($a, function($t) use ($b) {
return array_intersect($b, $t) == $b;
});
print_r($r);
array
(
[a] => array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
)