In this code snippet, we’ll learn how to pass and work with variables by reference in PHP. Variables can be passed either by value or by reference. Usually, we do it by value meaning you pass just the value and not the variable itself. So, any changes made locally inside the function scope won’t be seen outside of the function scope.
In this code snippet, we’ll learn how to work with strings in PHP. More specifically we’ll learn how to concatenate(join) strings, trim white spaces, make a string lower or upper case, get its length, check if it contains a substring and get its position, replace a substring, remove tags and slashes, split a string into an array on a specific character and join a string array back into a string.
In this code snippet, we’ll learn how to work with arrays in PHP. More specifically we’ll learn how to merge arrays, add/remove elements, reverse the array, remove duplicates, search the array, find its length, make associative arrays and get their keys. Associative arrays are use strings for indexes instead of numbers.
In this code snippet, we’ll learn how to work with JSON in PHP. You can use json_encode() to serialize and json_decode() to deserialize JSON. json_decode() also takes a second parameter(true/false) where you can specify if you want the JSON to deserialized to an associative array or to an object. In this post, you can see a practical example of JSON serialization/deserialization.
In this code snippet, we’ll see how to send HTTP requests with curl in PHP. Curl can be used to make HTTP request from the backend in PHP. In this desmonstration we’ll make a POST request to a test API.
In this post, we’ll learn how to implement reCAPTCHA on a website. Recaptcha is used to confirm that the user interaction on your site was made by a human and not by some script. For example, if you have a contact form on your website you would want to implement some human verification to prevent getting spammed by bots.
In this code snippet, we’ll learn how to perform string sanitization in PHP. An attacker might try to inject some malicious code into your backend. As a developer, you can prevent that by filtering/sanitizing and validating your data before working with it.
In this code snippet, we’ll learn how to read and write files with PHP. Let’s see the example below.
In this code snippet, we’ll learn how to upload files with Javascript. We will use the input HTML element and set its type to “file”. Then javascript can be used to retrieve the selected file from the input element and send it to the backend. You can use whatever you want for your backend: nodejs, PHP, Java or in this case I will use a C# Azure function.
In this code snippet, we’ll learn how to make graphs with Chart.js in Javascript. Chart.js is a very nice javascript library that allows you to visualize data by making different kinds of graphs/charts/plots. We’ll make a simple line graph in this example.