PHP数组交集与差集函数

  • array_intersect() : 比较数组的键值(不比较键名),返回交集
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");
$newArr = array_intersect($a1, $a2);
print_r($newArr); //Array ( [a] => red [b] => green [c] => blue )
  • array_intersect_assoc() : 比较数组的键值和键名,返回交集
$a1 = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2 = array("a"=>"red","b"=>"green","c"=>"blue");
$newArr = array_intersect_assoc($a1,$a2);
print_r($newArr); //Array ( [a] => red [b] => green [c] => blue )
  • array_intersect_key() : 比较数组的键名(不比较键值),返回交集
$a1 = array("a"=>"red","b"=>"green","c"=>"blue");
$a2 = array("a"=>"red","c"=>"blue","d"=>"pink");
$newArr = array_intersect_key($a1,$a2);
print_r($newArr); //Array ( [a] => red [c] => blue )
  • array_intersect_ukey() : 使用自定义方法方法比较数组的键名(不比较键值),返回交集
function myfunction($a,$b)
{
    if ($a===$b)
    {
        return 0;
    }
    return ($a>$b)?1:-1;
}

$a1 = array("a"=>"red","b"=>"green","c"=>"blue");
$a2 = array("d"=>"red","b"=>"green","e"=>"blue");
$newArr = array_intersect_ukey($a1, $a2, 'myfunction');
print_r($newArr); //Array ( [b] => green )
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值