How to Filter Array Rows by Matching Values Using array_uintersect()?

Keep Array Rows Matching Values in a Flat Array

Background:

You have an array, $arr1, with multiple columns and another array, $arr2, containing a list of values. The goal is to filter $arr1 and retain only the rows where the id column matches any value in $arr2.

Solution:

Using array_uintersect():

The most efficient solution utilizes the array_uintersect() function, which compares elements from two arrays using a user-defined callback. In this case, the callback checks if the id values match.

var_export(
    array_uintersect(
        $arr1,
        $arr2,
        fn($a, $b) =>
            ($a['id'] ?? $a)
            <=>
            ($b['id'] ?? $b)
    )
);

Explanation:

• The array_uintersect() function takes two arrays and a callback as arguments.
• The callback function is invoked for each element from both arrays, and it should return 0 if the elements are considered equal, 1 if the first element is greater, and -1 if the second element is greater.
• If an element does not have an id column, its raw value is used for comparison.
• The result is an array containing only the rows from $arr1 where the id column matches a value in $arr2.

Benefits of array_uintersect():

• It is a native PHP function, ensuring efficiency and compatibility.
• It performs sorting while evaluating, which optimizes performance.
• It provides a concise and readable solution compared to iterated calls of in_array().

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