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Okay, let's dive deep into searching multidimensional arrays in PHP by value. This is a common task when working with complex data structures, and understanding the techniques involved can significantly improve your code's efficiency and readability.

*Understanding Multidimensional Arrays*

First, let's make sure we're on the same page about what a multidimensional array is. In PHP, a multidimensional array is an array where each element can itself be another array. This nesting can go as deep as you need it to, creating arrays of arrays of arrays, and so on.

Here's a basic example of a multidimensional array representing a list of students with their names, IDs, and grades:



In this example, `$students` is a multidimensional array. Each element of `$students` is an associative array containing data about a specific student.

*Searching Techniques*

Now, let's explore different techniques for searching this type of array by value. We'll cover:

1. *Basic Iteration (Manual Loop):* The simplest but sometimes least efficient approach, especially for large arrays.
2. *`array_filter()`:* A powerful built-in function for filtering arrays based on a callback function. Very useful for creating new arrays with only the desired matches.
3. *`array_walk()`:* Primarily designed for iterating through an array and modifying its elements, but can be adapted for searching (less common for searching).
4. *`array_column()` and `in_array()`:* Efficient if you only need to search within a single column/key of the array.
5. *Recursive Search (for deeply nested arrays):* Necessary when the value you're looking for could be buried within multiple levels of arrays.

*1. Basic Iteration (Manual Loop)*

This is the most fundamental approach. You simply loop through the array and check if the value you're looking for exists in each element.



*Explanation:*
The `searchStudentsByName` function takes the array and the search value as input.
It ...

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