


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().
The above is the detailed content of How to Filter Array Rows by Matching Values Using array_uintersect()?. For more information, please follow other related articles on the PHP Chinese website!

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