我相信这是一个非常明显的问题，有一个函数可以做到这一点，但我似乎找不到它.在PHP中，我想知道数组中是否有重复项，并且尽可能高效.我不想像array_unique那样删除它们，我也不特别想运行array_unique并将其与原始数组进行比较，看看它们是否相同，因为这似乎效率很低.就性能而言，"预期条件"是数组没有重复项.
我只是希望能够做一些像这样的事情
if (no_dupes($array))
// this deals with arrays without duplicates
else
// this deals with arrays with duplicates
Is there any obvious function I'm not thinking of?
How to detect duplicate values in PHP array?
has the right title, and is a very similar question, however if you actually read the question, he's looking for array_count_values.