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Loop Through Multidimensional Arrays: PHP Code Examples (2023)

How to loop through a multidimensional array in PHP Arrays are iterable data structures meaning that an iterator or a loop can access its elements. Loops are central to any programming language, and PHP also has several different loops. The foreach loop is quite famous for associative arrays in PHP. The foreach references keys and values as it loops through an associative array. It also relieves a programmer of the possibility of running over the array out-of-bounds error, thrown when an index exceeds the array’s limit. Besides foreach, PHP has for, while, and do-while loops. This article answers how to loop through a multidimensional array in PHP, and thus it will focus on the foreach loop. Nevertheless, you can read an in-depth article about the loops in PHP. Look Through PHP Multidimensional Arrays Using the foreach loop Let’s review the syntax of the foreach loop through an example. $arr =…

array_values in PHP Multidimensional Array | 3 Code Examples

Using PHP array_values in a multidimensional array The array_values function retrieves the values from an associative array in PHP. It takes an array as an argument and returns an array including the values. The usage is straightforward for a linear associative array. However, things get complicated when PHP multidimensional array factors in. A multidimensional array can include numbers and levels of nested arrays, and a hard-coded approach does not go well with complexities. That’s why we seek a more generalized algorithm to use PHP array_values in a multidimensional array, and that’s precisely what this array intends to show you. So, before we come to the main course, let’s quickly review the PHP array_values function. PHP array_values - A review Here’s the function signature of the array_values. array_values(array $array): array The function receives an array and returns the retrieved values in an array. An example is as follows. PHP array_values Code…

Recursively Convert PHP Object to Array: 5 Code Examples (2023)

Conversion of Object to Array in PHP Classes and Objects are fundamentals of object-oriented programming. A class is a blueprint or a master plan similar to a building’s map, while objects are instances based on a class blueprint, just as buildings are instances of a master plan. Once you have a class, you can define as many objects. These objects have the same set of attributes, but these attributes’ values can be different. Besides attributes, a class can include some methods too. Here’s a detailed PHP guide about classes and objects. If you feel you lack context here, read it; otherwise, basic knowledge about classes and objects in PHP would suffice for this article, where we’ll see how to convert an object to an array in PHP. PHP Class Code Example Before we start, let’s see a Customer class in PHP. We’ll be converting its object to array PHP. <?php…

Merge two JSON objects using PHP: 3 Code Examples (2023)

Learn How to Merge two JSON Objects in PHP There are three steps to merge two JSON objects with PHP. First, use the json_decode function to convert to PHP array. Second, use the array_merge function to merge them. Finally, use the json_encode function to convert them back to JSON. Steps to Merging JSON Data in PHP convert to PHP array: json_decode merge PHP arrays: array_merge convert back to JSON: json_encode What is JSON Javascript Object Notation (JSON) is a text-based representation of structured data and a lightweight data exchange format. Various APIs provide JSON data, and developers have to parse that JSON at their end. JSON has become a communication source between the client and the server. Developers write functions to consume JSON data correctly in their applications. PHP has some useful functions for dealing with JSON. We will use these function to merge multiple JSON objects. Instead of jumping…

Find Array Keys with array_key_exists: 3 PHP Code Examples

Find a key in an array PHP An array in PHP keeps “KEY/VALUE” pairs, realizes the generic hash map. PHP features a variety of functions to work with the keys and values in a PHP array. There are functions for sorting, splitting, adding, removing values, and many other array functions. Similarly, there are functions for searching keys or values in an array. This article explores several options for finding a key in an array in PHP. Stick to the article till the end to learn these options and pick the one that fits well in your code. Let’s dive straight into the options for finding a key in a PHP array. #1 - Find a key in an array PHP using the foreach loop A foreach loop iterates over the array and references the key and the value. That’s why we can leverage it to find a key in an…

Using in_array vs array_search: 3 PHP Code Examples (2023)

PHP in_array and array_search are two functions that seem to have a common function, that is, to search an array for a value. However, they do this function in different ways, and they have different return types. We have already seen the array_search in-depth. We recommend you to go through that article to have some insights about the function. In a nutshell, the array_search looks for a value in a PHP array and returns the corresponding key. In comparison, the in_array function looks for a value and returns true if it exists. This article compares the two functions and highlights the difference between in_array and array_search. What is the difference between in_array and array_search? This section gives a review of the two functions and elaborates the differences between in_array and array_search. After the reviews and examples, you would clearly understand the difference between these PHP functions and be more aware…

array_combine vs array_merge: 5 PHP Code Examples

We have already seen array_combine and array_merge functions. While the function names suggest a similarity between the functions, both differ. In this article, we are going to explore the difference between array_combine and array_merge in PHP. Before diving straight into the topic, we suggest going through the posts for these functions. PHP array_combine; How to use with examples in PHP PHP array_merge : How to use with examples in PHP To understand the difference, we will review these functions. The reviews will describe the functions precisely, and you will understand how these functions differ. So, let’s get into the main stuff. What is the difference between array_combine and array_merge in PHP? As we have mentioned already, we will review these functions here. The reviews will serve as a refresher on the topic and be helpful to elaborate on the array_merge and array_combine difference in PHP. Difference between array_combine and array_merge:…

Merge 2+ PHP arrays with the Same Keys | 2023 Code Examples

Learn how to merge 2 arrays with the same keys using PHP We have seen various functions for merging PHP arrays. In this article, we will see how to merge two arrays with same keys PHP. Every function has a different mechanism when it comes to similar keys. Some functions overwrite the values, while others retain the values. We will explore different options. However, reading about the functions we will eventually be using here is recommended. array_merge in PHP array_merge recursive in PHP array_combine in PHP As we have mentioned already, every function deals with similar keys differently. There’s also a distinction between integer keys and string keys. So, let’s see these functions and understand the related quirks. Quick note: we also have articles on combining multiple PHP strings together. They dig into returning a single PHP string from multiple PHP array elements. Click here to learn how to combine…

Filter Multidimensional Array by Value with PHP Code Examples

Filter PHP multidimensional arrays code examples PHP multidimensional array can hold any number of nested arrays. Sometimes we just want a subset of the values of an array, and for that reason, we need to figure out how PHP filter nested array. In this article, we’ll see how to filter PHP multidimensional array. $filtered_arr = []; foreach($developers as $tech=>$developer) { array_push($filtered_arr,array_filter($developer,function($v,$k){ if($v["Experience(years)"] > 2) { return $v; } },ARRAY_FILTER_USE_BOTH)); } print_r(array_merge(...$filtered_arr)); We will explore three options to filter PHP multidimensional array by value. The first approach is iterative, the second recursive, and the third approach uses PHP array_filter function. So, let’s jump to the article without any further ado. Developers Array In the upcoming examples, we will be using an array that holds information about developers at a company. We call this array “developers.” This array is multidimensional and looks like this. So, make sure you check out the array…

Change array_walk_recursive() Value: PHP Code Examples

Recursion is an essential concept in computer science and programming. In simpler terms, it is a process of breaking down a problem into sub-problems and then solving these sub-problems using a common approach. It is a better alternative to the iterative approach, which can sometimes affect the performance. Recursion usually involves a function that calls itself over and over unless it meets an exit condition. This approach is frequently used in recursion problems. If you want to know further about recursion, see it in action in generating the Fibonacci sequence. Here we will use PHP built-in function that performs recursion over an iterable data structure, an array. PHP array_walk_recursive function provides a convenient way to dig deep into a multidimensional array without much hassle. However, an important caveat to keep in mind is that it gets down to the leaf nodes. So, any access or modification applies to the values…