Tag: recursive

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.…

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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…

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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…

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

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…

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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…

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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]…

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How to update specific key in multidimensional array in PHP

update specific key in multidimensional array in PHP
Update specific key in multidimensional array in PHP This article demonstrates how to recursively update specific key in multidimensional array in PHP.  Introduction Multidimensional arrays add alot to the complexity than a linear array. Similarly, updating specific keys in a multidimensional array using an iterative approach is complex and unpredictable.  So, in this article, we take up the challenge and explore how to update specific key in multidimensional array in PHP.  How to update key value in array PHP? The article “How to update key value in array PHP” explores three options for changing keys in a linear array.  A loop approach.The direct indexing approach.Using PHP array_search function. Out of these three, direct indexing stands out in terms of efficiency. That said, this article will use a mix of these to develop a generic function to handle multidimensional arrays. How to update specific key in multidimensional array in PHP Before…

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Convert PHP multidimensional array to CSV with fputcsv code examples

convert PHP multidimensional array to CSV
How to Convert PHP multidimensional array to CSV This article explores how to convert PHP multidimensional array to CSV. You can skip to the final section if you’re already familiar with reading and writing CSV files in PHP. <?php $employees = [ ['Id', 'Name', 'Age', 'Salary', 'Department'], ['1', 'Anna', '30', 20000, 'Finance'], ['2', 'Adam', '25', 15000, 'IT'], ['3', 'Bob', '32', 25000, 'Finance'], ['4', 'Cara', '20', 12000, 'Logistics'], ['5', 'Daniel', '28', 27000, 'Engineering'], ]; //Creates a new file employee_records.csv $file = fopen('employee_records.csv', 'w'); //w is the flag for write mode. if($file === false) { die('Cannot open the file'); } foreach($employees as $employee) { //Formats the employee record as CSV and writes it out employee_records.csv fputcsv($file, $employee); } //Closes the file. fclose($file); ?> Introduction PHP multidimensional arrays can be complex in structure as they have arrays within. These arrays are typically called “sub-arrays”, which may or may not be consistent in data…

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How to Use array_chunk with foreach loop with PHP Code Example

array_chunk with foreach loop
PHP array_chunk with foreach loop Code Examples PHP array_chunk function helps partition an array in chunks. The length argument defines the length for the chunks. If the array is not evenly divisible, the last chunk could have less than the specified length.  The article “array_chunk with examples”  explains everything you need to know about this function. Nonetheless, the article includes a recap of the function to set the ground for the rest of the sections. This article features a scorecard use case where we may need array_chunk with foreach loop. Stay with us till the end to get the most out of this article. <?php $names_score = [ "Tyson" => 9, "Jackie" => 10, "Ron" => 15, "Maximillian" => 20, "Sus" => 24, "Ryder" => 25 ]; $names_score_chunks = array_chunk($names_score, 2, true); //Sets the preserve key argument to true. /* OUTPUT [ [ "Tyson" => 9, "Jackie" => 10 ],…

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How to use array_map with a multidimensional array in PHP

array_map multidimensional array
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…

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