array_filter 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 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…

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…

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…

How to search for multiple values in a PHP array Create a variable that includes the array to be searched Create a separate variable that includes all of the values you want to search and find. Set a new variable that will include all of your final results Run the array_intersect function passing the array to be searched as the first parameter and the searching array as the second parameter. Assign the array_intersect results to your final results variable. Verify your results with a print_r or var_dump statement. Remove the print_r statement and continue processing requirements Searching multiple values in a PHP array Code Snippet <?php //An array with random country names. $country_arr = array("USA","Canada","Mexico","Germany","Italy"); //Look for these values and return the intersection. $search_values = ["USA","Canada","France"]; //It would contain the result of the array_filter intersection $intersection_arr = array_intersect($country_arr,$search_values); print_r($intersection_arr); /* OUTPUT Array ( [0] => USA [1] => Canada )…

How to Filter PHP arrays Before we get to the more complicated scenario of filtering arrays of objects by value, let's show how to do a PHP array filter in general. This is pretty simple to do using the array_filter function. You pass in the original array as the first parameter and then a function as the second parameter. The array_filter function uses the passed function on each element in the array to determine whether it should get returned. Anything returned truthy (not null or false) will get pushed into the new filtered array. Check out the example below to quickly filter an array in PHP by value. PHP array_filter Code Example // Let's setup a scenario where we need to filter an array by values with cows. $sampleArray = [0 => "horse", 1 => "cow", 2 => "pig", 3 => "cow"]; $filteredArray = array_filter( $sampleArray, function($val){ return $val ===…

How to Concat Strings in PHP to Combine Multiple Strings Together I use several methods for concatenating strings in PHP. The dot operator is the standard method for combining multiple strings together. Sometimes, I also need PHP concat arrays. I use the implode function in these cases. Check out the examples below to learn more about joining & combining PHP strings together. Concat String Code Example: Combine & Append 2 or More Strings to Form a New String // Here's a few quick ways to append to strings in php. // let's setup the base string. $myString = "Start with one string"; // Let's do a quick concatenation example. $myString = $myString . " and add 2nd string. "; // Let's show another way to append and concatenate a string in PHP $myString .= " Here's a 3rd string added. "; // What if we have another variable string that…

Tag: array_filter

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

PHP array_filter: 15 Array Filter Code Examples + Load Tests

How to Filter PHP Associative Arrays with 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)

Filter Multidimensional Array by Value with PHP Code Examples

Search for Multiple Values in PHP Array | 2023 Code Examples

Filter Array of Objects by Value: 5 PHP Code Examples in 2023

Join & Append PHP Strings: Concatenation Code Examples (2023)