09 Jul 2025

When dealing with PHP multi-dimensional array deduplication, you cannot use array_unique directly, and other methods are required. 1. Use serialize and unserialize to combine array_map to serialize the sub-array into a string and then deduplicate it, and then restore it to an array, which is suitable for two-dimensional arrays; 2. Customize the comparison function arrayUnique, which manually compares each element through traversal, which is highly flexible but less efficient; 3. Pay attention to the fact that the key names and order will affect the uniqueness judgment, and it is recommended to unify the structure or compare according to specific fields; 4. If deduplicate it according to a certain field (such as id), you can use a temporary array to record the existing field values, and only the items that appear for the first time are retained. The selection method should be determined based on the data structure and performance requirements.

12 Jul 2016

php array merge, php array. PHP array merging, PHP array There is a big gap between PHP's array and Java. Although PHP's weak type design may be criticized by many Java and C programmers, I think that in the array container

02 Jul 2025

There are three common ways to flatten multidimensional arrays. 1. Use recursive traversal to process arrays of any depth, and use is_array() to determine whether to continue in-depth; 2. It is safer to simulate the recursive process in an iterative way, suitable for large data volumes, and use the stack structure to save the elements to be processed; 3. If the array is two-dimensional and the child elements are arrays, it can be implemented concisely with array_merge combined with the expansion operator (...), but it requires support from PHP7.4; in addition, if you need to preserve key values, you can use the merge array by modifying logic.

04 Jul 2025

ToaccesselementsinamultidimensionalPHParray,usemultiplesetsofsquarebracketstonavigatethrougheachlevelofthestructure.1.Understandthearray’sstructure—multidimensionalarrayscontainotherarrays,eithernumericallyindexed,associative,orboth.2.Accesselementsb

13 Dec 2024

Linking Static Libraries to Other Static Libraries: A Comprehensive ApproachStatic libraries provide a convenient mechanism to package reusable...

05 Dec 2024

Flattening Multidimensional Arrays into One DimensionConverting a multidimensional array with numeric keys into a one-dimensional array can be a...