array_unique显示错误数组到字符串转换

For getting the unique values i am using unique values. Below is the code i am using

为了获得唯一值，我使用唯一值。以下是我正在使用的代码

array_unique($results_external);
aasort($results_external,"created_on");
$returns_buy_external[]=array_reverse($results_external, true);

If i use the code like this, below is the error i am getting

如果我使用这样的代码，下面是我得到的错误

A PHP Error was encountered Severity: Notice

遇到PHP错误严重性：注意

Message: Array to string conversion

消息：数组到字符串转换

Filename: models/product_model.php

文件名：models / product_model.php

Line Number: 3550

行号：3550

3550 line is array_unique($results_external);

3550行是array_unique（$ results_external）;

Can anyone help me, why it is getting error like this and how to solve it?

任何人都可以帮助我，为什么会出现这样的错误以及如何解决它？

results_external sample format coming is below

results_external样本格式如下

Array
(
    [0] => Array
        (
            [id] => 144
            [name] => test
            [slug] => test
            [images] => {"9eebd0f69772dd3bdf8c787864437c85":{"filename":"9eebd0f69772dd3bdf8c787864437c85.png","alt":"TRESemme Smooth and Shine","caption":""}}
            [track_stock] => 1
            [seo_title] => ttt
            [qty] => 0
            [product_type] => 0
            [price] => 0.00
            [saleprice] => 0.00
            [external_links] => http://test.com
            [external_price] => 285.00
            [external_saleprice] => 285.00
            [created_on] => 2013-11-08 15:03:24
        )
)

1 个解决方案

#1

As per the docs, array_unique compares elements as strings by default. This means your 2D array is being converted to an array of strings (all being "Array" and generating the array-to-string Notice) or which only one can be returned as unique.

根据文档，array_unique默认情况下将元素作为字符串进行比较。这意味着您的2D数组正在转换为字符串数组（全部为“数组”并生成数组到字符串通知），或者只有一个可以作为唯一返回。

Use the SORT_REGULAR flag to compare the elements as they are, but be aware that arrays are only considered equal if they have the same key-value pairs.

使用SORT_REGULAR标志按原样比较元素，但要注意，如果数组具有相同的键值对，则它们仅被视为相等。