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 )
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。
时间: 2024-10-10 17:21:53