Tag: associative array

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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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…

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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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How to convert XML to Array or Object in PHP

XML to Array in PHP
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 = '&lt;courses> &lt;course> &lt;title>Fundamentals of Programming&lt;/title> &lt;credithours>3 + 1&lt;/credithours> &lt;prerequisites>None&lt;/prerequisites> &lt;/course> &lt;course> &lt;title>Object Oriented Programming&lt;/title> &lt;credithours>3 + 1&lt;/credithours> &lt;prerequisites>Fundamentals of Programming&lt;/prerequisites> &lt;/course> &lt;/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…

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How to Sort a Multidimensional Array by Value?

sort multidimensional array by value
Sort Multidimensional Array by Value Here’s the code from the article using the usort function to sort multidimensional array by value. usort($employeesData, function($a, $b) { return $a["Salary"] - $b["Salary"]; }); //OUTPUT /* [ ["Name" => "Mosh", "Salary" => 120000], ["Name" => "Noah", "Salary" => 220000], ["Name" => "Dany", "Salary" => 320000], ["Name" => "Robert", "Salary" => 330000], ["Name" => "Jenny", "Salary" => 440000], ["Name" => "Kylie", "Salary" => 500000], ] */ That’s one way of sorting a multidimensional array in PHP. Learn more about sorting in this article. An Example of a Multidimensional Array  A multidimensional array could be fairly complex, spanning many dimensions or arrays within arrays. However, let's keep it realistic and simulate data that closely matches a database resultset.  A Database query often returns a multidimensional array of data. For instance, here’s a snippet of a database table having rows for employee names and their annual salaries.…

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How to fix array to string conversion in PHP

array to string conversion in php
Array to string conversion in PHP Array to string conversion in PHP warning occurs when PHP tries to implicitly convert array to string. One of the recommended fixes is as follows. <?php $array = [ "a" => ["b" => ["c" => "d"]], "e" => "f", "g" => ["h", "i"=>["j","k"]] ]; echo 'The array is: '.json_encode($array); //The array is: {"a":{"b":{"c":"d"}},"e":"f","g":{"0":"h","i":["j","k"]}} ?> There are other fixes too. Stay tuned to the article to learn more. Introduction PHP implicitly converts primitive types like integer, string, and boolean to other types based on the context. For instance, the following example demonstrates implicit conversion. Learn more about type conversions. <?php $integer = 101; $boolean = true; $string = '2'; echo 'Hello to PHP '.$integer.'!!'; //Hello to PHP 101!! echo 2 + $boolean; //3 echo 3 * $string; //6 ?> See how PHP infers the type from the context. It converts boolean (true) to 1 and…

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How to fix undefined index in PHP

undefined index in PHP
Undefined Index in PHP The undefined index in PHP or undefined array key in PHP arises when trying to access an array key that doesn’t exist. Here’s one of the recommended fixes from this article. <?php $arr = [ "Name" => "Selina", "Job Title" => "Software Developer", ]; $name = isset($arr["Name"]) ? $arr["Name"] : "N/A"; $title = isset($arr["Job Title"]) ? $arr["Job Title"] : "N/A"; $experience = isset($arr["Experience"]) ? $arr["Experience"] : "N/A"; echo "Hi, this is ".$name.PHP_EOL; echo "I am a ".$title.PHP_EOL; echo "I have ".$experience." years of experience".PHP_EOL; //Key doesn't exist. /* OUTPUT Hi, this is Selina I am a Software Developer I have N/A years of experience */ ?> Stay tuned to the article to learn more about the undefined array key in PHP and how to fix it. Introduction PHP associative arrays have key and value pairs. The keys are either numeric or string. The associated values can…

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How to Sort Array of Objects by Property in PHP

sort array of objects by property in PHP
Sort Array of Objects by Property in PHP The article answers how to sort array of objects by property in PHP. Here's a quick overview of the solution. $employees_arr = [ new Employee('5', 'Brian', 90000, '25'), new Employee('1', 'Allen', 60000, '29'), new Employee('2', 'Kylie', 50000, '27'), new Employee('3', 'Jeane', 80000, '35'), new Employee('4', 'Franklin', 75000, '30'), ]; //Sorts the array by the property salary usort($employees_arr, function($a, $b) { return $a->salary - $b->salary; }); If the code doesn't make sense to you now, don't worry! Just stick with the article to the end, and you'll be able to understand all about the code above and perhaps a couple of other interesting PHP stuff! Plus, the article now includes sorting based on two or more properties. Check that out as well. Relevant Content: PHP usort Function The article uses the usort function to sort array of objects by property value in PHP.…

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