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PHP array_diff_uassoc() function (with example)

Hey guys,

I'm currently working on a PHP project and I came across the `array_diff_uassoc()` function. I've read the documentation, but I'm still a bit confused and I was hoping someone could help clarify it for me.

Here's my understanding so far: `array_diff_uassoc()` is a PHP function that compares the keys and values of two or more arrays and returns the differences. It takes a user-defined comparison function to determine equality of key-value pairs.

However, I'm still not quite sure how to use it effectively. Can anyone provide a simple example of how `array_diff_uassoc()` works and explain the steps involved? It would be really helpful if you could break it down for me and provide a clear explanation.

Thanks in advance for your help!

All Replies


Hey folks,

I stumbled upon this thread and wanted to share my personal experience with the `array_diff_uassoc()` function in PHP. While the previous explanation was great, I'd like to provide a slightly different perspective.

In a recent project, I had to compare two arrays, `$array1` and `$array2`, based on both keys and values. Using the `array_diff_uassoc()` function was incredibly useful in this scenario.

To use it effectively, you need to define a comparison function that determines what equality means for the key-value pairs. This function is passed as the third argument to `array_diff_uassoc()`.

In my case, I needed to compare the values of the arrays in a case-insensitive manner. So, here's an example of the callback function I used:

function compareValues($a, $b) {
return strcasecmp($a, $b);

By using the `strcasecmp()` function, I ensured that the comparison was not case-sensitive. This allowed me to catch differences in values regardless of their case.

Now, let's see how to use `array_diff_uassoc()` with our arrays and the callback function:

$result = array_diff_uassoc($array1, $array2, 'compareValues');

Upon calling this function, `$result` will contain the key-value pairs where the values differ between `$array1` and `$array2`. For example:

array("name" => "John", "age" => 30)

In this case, the "name" and "age" values in `$array1` differ from `$array2`, and that's what is returned in the result array.

I hope this provides a fresh perspective on using `array_diff_uassoc()` and helps you in your project. Feel free to ask if you have any more questions. Good luck with your PHP endeavors!


Hey there!

I've used `array_diff_uassoc()` in a recent project, so I can definitely share my experience with you. Let me walk you through a simple example to help clarify things.

Imagine we have two arrays: `$array1` and `$array2`.

$array1 = array("name" => "John", "age" => 30, "country" => "USA");
$array2 = array("name" => "John", "age" => 25, "country" => "UK");

If we want to find the differences between these two arrays based on both keys and values, we can use `array_diff_uassoc()`.

First, we need to define a comparison function that will determine what is considered equal. This is where the `callback` function comes into play.

Here's an example of the callback function:

function compareValues($a, $b) {
if ($a === $b) {
return 0;
return ($a > $b) ? 1 : -1;

In this example, the function compares the values (`$a` and `$b`) and returns 0 if they are equal, 1 if `$a` is greater, and -1 if `$b` is greater.

Now, let's use `array_diff_uassoc()` with our arrays and the callback function:

$result = array_diff_uassoc($array1, $array2, 'compareValues');

In this case, `$result` will be an array containing the key-value pairs where the values differ between the two arrays. In our example, it would return:

array("age" => 30, "country" => "USA")

This means that the "age" and "country" values in `$array1` were different compared to `$array2`, and the resulting array gives us those differing key-value pairs.

I hope that helps! Let me know if you have any further questions or need more clarification. Happy coding!

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