PHP Manual
ArrayIterator
Sort with a user-defined comparison function and maintain index association

ArrayIterator::uasort

(PHP 5 >= 5.2.0, PHP 7)

ArrayIterator::uasort — 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

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