ArrayIterator::uasort()
(PHP 5>=5.2.0,PHP 7)
Sort with a user-defined comparison function and maintain index association
说明
public ArrayIterator::uasort(callable $cmp_function) : void
This method sorts the elements such that indices maintain their correlation with the values they are associated with,using a user-defined comparison function.
Note:If two members compare as equal,their relative order in the sorted array is undefined.
参数
- $cmp_function
在第一个参数小于，等于或大于第二个参数时，该比较函数必须相应地返回一个小于，等于或大于0的整数。
callback(mixed $a,mixed $b) : int
返回值
没有返回值。
参见
- ArrayIterator::asort() Sort array by values
- ArrayIterator::uksort() Sort by keys using a user-defined comparison function
usort()使用用户自定义的比较函数对数组中的值进行排序