array_map Archives - Crafty Techie

Read JSON Files with PHP: 5 Code Examples (best in 2023)

JSON data can be accessed and utilized with many programming languages. In this article, we will learn how to read a JSON file in PHP. We will discuss all the methods used to read a JSON file, convert JSON objects into an array, and display it in PHP. Let’s first learn about what JSON is. Read a JSON file with a PHP code example <?php // Reads the JSON file. $json = file_get_contents('./test_data.json'); // Decodes the JSON file. $json_data = json_decode($json,true); // Display the JSON data. print_r($json_data); ?> Table of Contents What is JSON? Encode JSON Data in PHP. Decode JSON Data in PHP. Read a JSON File using the file_get_contents() Function in PHP. Read JSON Files with PHP Code Examples Explored. What is JSON? JSON stands for JavaScript object notation. The JSON data is written as name/value pairs, and it is basically a lightweight data-interchange format that is very…

PHP array_filter: 15 Array Filter Code Examples + Load Tests

How to use the PHP array_filter function to filter PHP Arrays Code Example <?php $dogBreedsILove = ["chihuaha", "collie", "golden retriever", "terrier"]; // I need all of the retreivers in the list. $retrievers = array_filter($dogBreedsILove, function ($breed) { return stripos($breed, "retriever"); } print_r($dagBreedsILove); PHP Array Filter Learning Path This article is part of our large series on filtering arrays. Feel free to browse through the articles we have listed below and dig further into some unique scenarios. These articles will help you level up your PHP development skills How to filter PHP associative array How to use Doctrine ArrayCollection map and filter functions Array of objects in PHP | How to create, sort, filter, merge & search them Filter an array of objects by values in PHP How to filter arrays of objects by keys in PHP Filter multidimensional array by value in PHP PHP Arrays Array Filter Load Testing: array_filter…

How to work with an array of objects in PHP code Can you have arrays of objects in PHP Yes, you can definitely create, store, filter, merge and work with an array of objects in PHP. You can decode JSON objects as arrays as well as create array collections of PHP arrays. PHP offers many solutions to work with an array of objects. This article will break down 2 common scenarios when working with arrays of objects in PHP. Visitors come to us many times to ask questions about working with PHP classes and objects as well as JSON objects. Both situations are common but do have unique requirements. Let's first get into PHP classes and objects. Then we will follow it up with Working with PHP Classes and Objects PHP was originally designed as a purely procedural language. Starting in PHP 4 and greatly extending into PHP 5, it…

5 Clone & Deep Copy Arrays with PHP Code Examples in 2023

How to Clone a Deep Copy Array in PHP Define your original array in PHP as a variable Create a custom PHP function called cloneArray with a single parameter for array Inside the cloneArray function instantiate a new empty array. Create a foreach loop inside of the custom function to iterate the passed array Run an if statement in the loop to determine if the element is an array Call the cloneArray function recursively when the element is an array Assign a new value to the cloned array variable. Return the cloned array from the custom function. Pass in your array to deep clone to the custom cloneArray function to start the process. Clone Arrays using PHP Code Example function cloneArray(array $arr) { $clone = []; foreach($arr as $k => $v) { if(is_array($v)) $clone[$k] = clone_array($v); //If a subarray else if(is_object($v)) $clone[$k] = clone $v; //If an object else $clone[$k]…

PHP array_map with a multidimensional array PHP array_map works with a multidimensional array either iteratively or recursively. The iterative approach is more hardcoded while the recursive approach is more generic and efficient. This article explores both of these approaches. Introduction PHP array_map is a higher-order function known for transforming array elements based on the logic of the function it receives. There has already been much discussion on higher-order functions and how to use them. The three most popular higher orders are array_map, array_filter, and array_reduce. So, if you’re curious about knowing all the caveats involved, you can always jump to the articles that have been linked. This article explores ways to use array_map with multidimensional arrays. Generally, array_map works with linear arrays. Internally, it iterates over the array elements and performs the transformations. So, we need to find a workaround for multidimensional arrays. PHP array_map - A Quick Review If…

Doctrine ArrayCollection Map and Filter Functions Doctrine ArrayCollection is a wrapper for native arrays, having all the methods that PHP defines for their native counterpart. So, this article explores the map and array filter methods for Doctrine collections. Introduction ArrayCollection is an implementation of the Collection interface available in one of the Doctrine’s projects. Doctrine is an open-source project that includes PHP libraries focused on dealing with databases – persistence and mapping. There has been a lot of information about Doctrine and ArrayCollection in the introductory article. This article explores the two crucial functions - map and filter. These functions are available in PHP already, but they won’t work with ArrayCollection as such. To understand why we need to understand the ArrayCollection versus native PHP array. Once we understand how ArrayCollection is different from the native arrays, we’ll move forward to the map and filter methods that come along with…

This article reviews the array_map, array_walk, and array_filter functions and includes examples to clarify their differences. If you’re already familiar with these functions, feel free to skip to the last section for a quick overview. Using the PHP array_map vs array_walk & array_filter functions PHP array_map, array_walk, and array_filter are higher-order functions. These functions take functions as arguments, commonly known as callback functions. If you’re coming from a Javascript background, you can understand the significance of the callbacks function in asynchronous programming. However, PHP uses these callback functions on an array and consequently accesses, transforms, or filters array elements based on the logic of the callback function. Some widely known higher order functions are array_map, array_walk, and array_filter. FuelingPHP has in-depth articles on each of these. This article aims to analyze these functions and emphasize their differences comparatively. The article includes sections on each of these with relevant examples to…

Pass additional parameters in array_map PHP Code Examples The array_map PHP callback cannot access variables outside its scope by default. So, PHP features the “use” keyword, enabling developers to pass more parameters to the function. The article tries to explain it without diving into complexities. Introduction - array_map PHP The array_map PHP is a higher order function. A higher order function takes another function, known as a callback function usually. Higher order functions are eminent in programming languages like Javascript and Python, but they have also made their way to more conventional languages like PHP and Java. We have done an in-depth article about this function, and it is suggested to go through it before proceeding to have a solid ground. This article also reviews PHP array_map before jumping in straight to the subject of how to pass additional parameters in the array_map PHP function. PHP array_map - A review…

Using Associative Array Keys in PHP array_map We have already seen the PHP array_map and some important related caveats. In a nutshell, the array_map function applies a callback to every element of the given arrays. One essential quirk of the function is that it passes the values of the given arrays to the callback function. There is no inherent way to pass a key as a parameter to the callback function. PHP array_map This article will show how to use associative array keys in PHP array_map function. To get the most out of this article, we recommend reading our article about array_map PHP. PHP array_map: How to use it in PHP with examples. Multiple arrays usage - A review Let’s review the array_map function when it gets more than one array as an argument. This review is crucial because we will use two arrays to use associative keys in the…

PHP Code to Read a CSV File With Headers into an Associative Array Open the csv file and get the contents with the array_map function. Use the array_shift method to get your header row. Create a PHP array to store your CSV body content. Loop through the remaining rows with a foreach loop. Check to make sure the loop content is not empty. Push a new element to the CSV array that you created using the array_combine function. Print and test your results. Continue processing as required. <?php //Map lines of the string returned by file function to $rows array. $rows = array_map('str_getcsv', file('employees.csv')); //Get the first row that is the HEADER row. $header_row = array_shift($rows); //This array holds the final response. $employee_csv = []; foreach($rows as $row) { if(!empty($row)){ $employee_csv[] = array_combine($header_row, $row); } } print_r($employee_csv) Comma-separated files or CSVs are popular for book-keeping and persisting data. Although large-scale…

Tag: array_map

Read JSON Files with PHP: 5 Code Examples (best in 2023)

PHP array_filter: 15 Array Filter Code Examples + Load Tests

15+ Array of Objects PHP Code Examples | Easy 2023 Tutorial

5 Clone & Deep Copy Arrays with PHP Code Examples in 2023

How to use array_map with a multidimensional array in PHP

Use the Doctrine ArrayCollection Map and Filter Functions in 2023

array_map, array_walk, & array_filter: What’s the Difference (2023)

How to pass additional parameters in array_map PHP function

Use Associative Array Keys in array_map: 3 PHP Code Examples

Read CSV Files to Associative Array with Headers PHP Examples