array Archives - Crafty Techie

PHP Data Structures: A Beginner’s Guide to Get Started | 2023

PHP Data Structures This article is a comprehensive overview of data structures along with basic code examples in PHP. The article overview the following six fundamental data structures: Array. Linked list. Stack. Queue. Tree. Graph. So, let’s begin our journey with the most fundamental and important aspects of computer science and programming - Data structures. Article Highlights Following are some important highlights from the article. A data structure is a way of organizing, managing, and storing data in a computer. Different types of data structures differ in terms of storage and retrieval patterns. Choosing the right data structure can greatly improve the efficiency and performance of a program. Data structures can be broadly classified into linear and non-linear classes. An algorithm is a set of well-defined steps or instructions to solve a problem. An array is a linear data structure consisting of a collection of elements. An index or a…

PHP in_array(): Check if Array Contains Value (5 Code Examples)

How to Use PHP in_array function to check if the array contains a value Arrays are an important data structure in PHP, allowing developers to store and manipulate a collection of values. Often, developers need to check if an array contains a specific value. One way to accomplish this in PHP is using the in_array() function. This function returns a boolean value indicating whether a specified value exists in an array. This article will discuss the syntax and usage of the in_array() function with examples. PHP in_array Code Example <?php /* Recursive approach */ $students = array( array("name" => "John", "age" => 20, "courses" => array("Math", "Science")), array("name" => "Mary", "age" => 22, "courses" => array("History", "English")), array("name" => "Peter", "age" => 24, "courses" => array("Computer Science", "Physics")) ); function searchArray($needle, $haystack) { foreach($haystack as $value) { //If array within array if(is_array($value)) { //Recursively call the function on the array.…

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…

Upload & Save Image Files Using PHP Code Example in 2023

How to Upload and Save an Image File with PHP Confirm your PHP.ini settings are correct. Create an HTML form to upload the image file Add the file input element and a submit button in the form. The image is added to PHP's TMP storage location on submission. Create a PHP script to transfer the image to your final destination. Update your database with the storage location using PHP code Return a 200 response back to the browser with the file reference. PHP Code to Upload an Image File & Save it to Server We can use a PHP script with an HTML form to upload files to the server. When we upload a file, it initially uploads into a temporary directory and is then relocated to the target location by a PHP script. Here’s the simple php image upload script. <?php //If form submits successfully. if($_SERVER["REQUEST_METHOD"] == "POST"){ //…

2 Initialize Empty Arrays Using PHP Code Examples in 2023

Initialize An Empty Array in PHP Code Example We can initialize an empty array using either the square brackets syntax or array(), as follows. $firstArray = []; $secondArray = array(); The article goes beyond the basics and includes a case study where we use an array to implement an in-memory cache. Curious to know how that works? Stay tuned to learn more. Relevant Content: PHP Arrays Arrays are fundamental data structures, no doubt why they form the basis for many other data structures like stacks and queues. Apparently, a fundamental data structure, arrays can be a super helpful component in competitive programming, complex algorithms, or an actual program. PHP arrays can be categorized as Indexed arrays with numeric keys. Associative arrays with named keys. Multidimensional arrays with sub-arrays. FuelingPHP has an in-depth article on the types of arrays in PHP. Scenario: Retrieving Notifications in a Social Media Application Consider a…

Create PHP Array of Objects: 5 Code Examples in 2023

How to Create an Array of Objects in PHP There are 2 steps to creating arrays of objects in PHP. You will want first to initialize an empty array. Once complete, you should pass that reference to any object creation function. Create your object and attach it as a new reference to your PHP array. Creating Array of Objects PHP Code Example //Initialize an array. $employees = array(); //Add objects $employees[0] = new Employee("Steve Hans", "111-222-333", "60,000"); $employees[1] = new Employee("Raymond Rize", "112-212-313", "80,000"); $employees[2] = new Employee("Sams Brian", "122-213-713", "70,000"); PHP is both a procedural & object-oriented programming language, and this article overviews the basics. Stay with us till the end to learn more. Relevant Content: Classes & Objects Array of Objects in PHP | Create, Sort, Filter, Merge, Search, Etc How to Sort Array of Objects by Property in PHP How to shuffle an array of objects in…

How to Filter PHP Associative Arrays with Code Examples in 2023

How to Filter PHP Associative Array Code Example You will want to use the array_filter function on a PHP associative array to filter correctly. Many times, your array may also be multi-dimensional. We recommend creating a unique array filter function using a recursive pattern. Here's a sample code snippet from the article. // Option 1: Using a array_filter function function filterStudentsBySemesterOne($students_data) { return array_filter($students_data, function($v) { return $v["Semester"] > 5; }); } // Option 2: Filter associative arrays using an iterative approach (not recommended) function filterStudentsBySemester($data, $semester) { // Do some logic to determine whether we can return true. $filtered_arr = []; foreach($data as $k => $v) { if( $v["Semester"] > $semester ) { $filtered_arr[$k] = $v; } } return $filtered_arr; } This code is an example of an iterative approach. There are other options as well. Check out the article to see more. Relevant Content - PHP Associative Arrays…

Code Snippet: XML to Array in PHP The article explores how to convert XML to array or object in PHP. Here’s a snippet from the article. <?php $courses_xml = '<courses> <course> <title>Fundamentals of Programming</title> <credithours>3 + 1</credithours> <prerequisites>None</prerequisites> </course> <course> <title>Object Oriented Programming</title> <credithours>3 + 1</credithours> <prerequisites>Fundamentals of Programming</prerequisites> </course> </courses>'; $xml = simplexml_load_string($courses_xml); $json = json_encode($xml, JSON_PRETTY_PRINT); $array = json_decode($json, true); ?> That’s just one way of going about this problem. Learn more about this topic in the following sections. Relevant Content: JSON to XML Conversion The article “How to convert XML to JSON in PHP” sets a solid foundation for XML to array in PHP. We suggest reading that article as this article borrows alot from it. We will see that the existing solution adds only one extra function call to get an array or object, and the rest of the code is similar. So without any further…

Code Snippet: Array to XML in PHP This article answers how to convert array to XML in PHP. Here’s a snippet from the article. <?php $students_data = [ "Andy" => ["ID"=>"1001", "Electives"=>["Computer Science", "Calculus"]], "Benjamin" => ["ID"=>"1002", "Elective"=>["Electronics", "Digital Logic Design"]], "Catheline" => ["ID"=>"1003", "Elective"=>["Economics", "Political Science"]], "Dexter" => ["ID"=>"1004", "Elective"=>["Computer Science", "Discrete Mathematics"]], "Eion" => ["ID"=>"1004", "Elective"=>["Computer Science", "Digital Logic Design"]], "Franklin" => ["ID"=>"1005", "Elective"=>["Mathematics", "Physics"]], ]; function arraytoXML($arr, &$xml) { foreach($arr as $key => $value) { if(is_int($key)) { $key = 'Element'.$key; //To avoid numeric tags like <0></0> } if(is_array($value)) { $label = $xml->addChild($key); arrayToXml($value, $label); //Adds nested elements. } else { $xml->addChild($key, $value); } } } $xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Students></Students>'); arraytoXML($students_data, $xml); $xml->asXML('output.xml'); ?> That’s one way of doing the conversion. The article features a third-party package that will make your life a lot easier than reinventing the wheel. Stay till the end to learn more.…

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Tag: array