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How to remove identical elements from two arrays using PHP
- PHPzOriginal
- 2023-04-23 10:08:01417browse
In development, we often encounter situations where we need to compare two arrays and then perform some operations based on their similarity. In PHP, we can use the array_intersect function to get the common elements in two arrays, or the array_diff function to get different elements. However, if we need to find the same elements in two arrays and remove them from the arrays, we need to use another method.
In this article, we will introduce how to use PHP to remove the same elements from two arrays. Here’s what we need to know:
- Principle
- Implementation steps
- Sample code
Principle
Before understanding how to remove identical elements in PHP, let’s take a look at the principle. The following is what we need to understand:
PHP provides a function array_unique, which can return a deduplicated array. If we merge two arrays into one and deduplicate them using the array_unique function, the resulting array will only contain elements that are different from both arrays.
In this deduplicated array, we can use the array_diff function to obtain elements that only appear in one array, and use the array_intersect function to obtain elements that exist in both arrays.
Implementation Steps
Now, let’s take a look at how to use PHP to remove the same elements from two arrays. Here are our steps:
- Create two arrays $first and $second.
- Merge the $first and $second arrays, and use the array_unique function to remove duplicate elements to obtain the $unique array.
- Use the array_diff function to get elements that only exist in the $first array, and store the results in $diff_one.
- Use the array_diff function to get the elements that only exist in the $second array, and store the results in $diff_two.
- Use the array_merge function to merge $diff_one and $diff_two into an array.
- Elements in array $unique that match elements in the array generated in step 5 will be removed from the $unique array.
Sample Code
The following is a sample code to demonstrate the steps described above:
$first = array('apple', 'banana', 'orange', 'grape');
$second = array('peach', 'kiwi', 'banana', 'grape');
$unique = array_unique(array_merge($first, $second));
$diff_one = array_diff($first, $second);
$diff_two = array_diff($second, $first);
$final_array = array_merge($diff_one, $diff_two);
In the above code, $final_array will contain $first and The $second array will contain unique elements, while the $unique array will only contain elements that are different from the two arrays.
Using the above process, you can remove the same elements from two arrays.
Conclusion
In this article, we learned about a way to remove identical elements from two arrays in PHP. We understand its principles and implementation process, and show sample code, hoping to be helpful to readers during development.
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