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

$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 "
"; 
$num = array_intersect_assoc($array,$array1); 
print_r($num); 
echo "
"; 
$num = array_intersect_key($array,$array1); 
print_r ($num); 
?> 
 
　运行结果： 
 代码如下:

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 ) 
 
总结： 
　　　　1.array_intersect()函数进行的比较只有数组值的比较，而且存在如”Red“和”Red2“比较时会返回"Red"，反之则不会返回"Red2"; 
　　　　2.array_intersect_assoc()函数是将数组的值与键值一起比较，而且不会存在array_intersect的情况，适用于较严格的比较； 
　　　　3.array_intersect_key()函数适用于比较两个数组键值的交集，返回的并不只有键值，而是键值和对应的数组值。