PHP中数组的集合理论联合 [英] Set Theory Union of arrays in PHP

问题描述

数学中有3个集合运算:交、差和并(统一).在 PHP 中我们可以用数组来做这个操作:

There are 3 operations with sets in mathematics: intersection, difference and union (unification). In PHP we can do this operations with arrays:

• 交点:array_intersect
• 区别:array_diff

union 的作用是什么?

结果数组中不能有重复项(例如 array_intersect 和 array_diff).

No duplicates can be in the result array (like array_intersect and array_diff).

如果索引是数字，则 array_merge 不会覆盖原始值，但会被附加 (PHP 文档).

If indexes are numeric then array_merge will not overwrite the original value, but will be appended (PHP docs).

推荐答案

试试array_merge:

array_unique(array_merge($array1, $array2));

PHP 手册

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