PHP数组的交集array_intersect(),array_intersect_assoc(),array_inter_key()函数的小问题

时间：2011-05-29 来源：Picaso

　　求两个数组的交集问题可以使用array_intersect(),array_inersect_assoc,array_intersect_key来实现，其中array_intersect()函数是求两个数的交集，返回一个交集共有元素的数组（只是数组值得比较）、array_intersect_assoc()函数是将键值和值绑定，一起比较交集部分、array_intersect_key()函数是将两个数组的键值进行比较，返回键值交集的数组。

　　但实际应用中也遇到了一些小问题，正如下：

　　实例：

    <?PHP
         $array = array("red"=>"Red","green"=>"red4","Red15"=>"Red",7=>"Level","Width"=>"Red","azzzz1"=>"art","peak"=>158);
        $array1 = array("red"=>"Red2","greena"=>"red","Red15"=>"Red",7=>"Level","Width"=>"Red","azzzz"=>"art","peak"=>158);
        $num = array_intersect($array,$array1);
        print_r ($num);
        echo "<br />";
        $num = array_intersect_assoc($array,$array1);
        print_r($num);
        echo "<br />";
        $num = array_intersect_key($array,$array1);
        print_r ($num);

    ?>

　　运行结果：

Array ( [red] => Red [Red15] => Red [7] => Level [Width] => Red [azzzz1] => art [peak] => 158 ) 
Array ( [Red15] => Red [7] => Level [Width] => Red [peak] => 158 ) 
Array ( [red] => Red [Red15] => Red [7] => Level [Width] => Red [peak] => 158 )