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PHP array_intersect() function (with example)

Hey everyone!

I've been working with arrays in PHP, and I recently came across the array_intersect() function. I read the official documentation, but I'm still struggling to understand how it really works and how it can be used effectively.

From what I understand, array_intersect() is used to find the values that are present in all given arrays. But I'm not quite sure how to use it in practical scenarios. Could someone please provide me with a clear example to help me grasp it better?

If anyone has any practical examples or tips on how to use array_intersect() effectively, I would really appreciate it. Thanks in advance!

All Replies


Hey everyone!

I thought I'd jump in and share my own personal experience with using the array_intersect() function in my PHP projects.

In one particular project, I had to compare and merge data from different sources. These sources provided me with arrays containing various information, such as customer details and product data. However, I needed to extract the common elements between these arrays to eliminate any duplicates or inconsistencies.

Thankfully, array_intersect() came to the rescue. By using this function, I was able to effortlessly find the values that existed in all the arrays, ensuring data integrity and consistency.

Here's a simplified example to demonstrate how I used it:

$array1 = ['apple', 'banana', 'cherry', 'date'];
$array2 = ['banana', 'date', 'grapefruit', 'kiwi'];
$array3 = ['apple', 'date', 'kiwi', 'mango'];

$commonValues = array_intersect($array1, $array2, $array3);

After executing this code, the $commonValues array would contain only the value 'date' since it was the only value present in all three arrays.

By employing array_intersect(), I effectively eliminated any redundant or conflicting data, ensuring that I was working with accurate information across my project.

I hope sharing my experience helps you understand the practical application of array_intersect() in real-world scenarios. If you have any further questions, feel free to ask!


Hey there!

I recently used the array_intersect() function in one of my PHP projects, so I thought I could share my experience with you.

In my project, I had two arrays: $array1 and $array2. Both arrays had different sets of values, but I needed to find the common values between them. This is where array_intersect() came in handy.

Here's an example of how I used it:

$array1 = array('apple', 'banana', 'cherry', 'date');
$array2 = array('banana', 'date', 'grapefruit', 'kiwi');

$commonValues = array_intersect($array1, $array2);

After executing the above code, the $commonValues array would contain 'banana' and 'date' since those values exist in both $array1 and $array2.

I found this function very useful when dealing with data comparison, such as finding shared elements between different datasets or filtering out unwanted elements.

Hope this example helps you understand how array_intersect() works in a practical scenario. Let me know if you have any further questions.


Hey fellow developers,

I stumbled upon this discussion about the array_intersect() function and I wanted to add my own personal experience to it.

In a recent project, I was tasked with building a feature that required finding common elements between multiple arrays. After digging through PHP's array functions, I found array_intersect() to be the perfect tool for the job.

Let me share a unique example where I leveraged array_intersect(). Imagine you have an e-commerce website with different product categories, each represented by an array of product IDs. You want to implement a filter feature that shows only the products that are present in all selected categories.

Here's a snippet to demonstrate it:

$category1Products = [101, 102, 103, 104];
$category2Products = [102, 104, 106, 108];
$category3Products = [103, 104, 107, 109];

$commonProducts = array_intersect($category1Products, $category2Products, $category3Products);

After executing this code, the $commonProducts array would contain only the product ID '104', as it is the only value present in all three categories.

Using array_intersect() in this way allowed me to easily filter and display only the items that belong to all selected categories, providing a seamless user experience.

I hope this example brings more clarity on how array_intersect() can be leveraged in real-world scenarios. Feel free to ask if you need more assistance!

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