Search Results for: php array

Variable variables let you dynamically access variables by their name. Sound confusing? This article will explain PHP variable variables, and provide code examples. What is a variable? In computer programming, variables store a value, or reference to a value, for later use. Variables have names, and when you access a named variable, the value it contains can be read or updated. Declaring variables in PHP In PHP, a variable is declared when it is first used: Above, a variable named $myVariable is declared using the = (equals) operator, and assigned the … Read more

This article will show you how to delete a single file or multiple files in PHP using the unlink() function, and provide code examples. Once you have file uploads working in PHP, you may want to allow your users to delete files they no longer wish to keep. Read on to find out how. There is no PHP Function called ‘Delete’ To clear up any confusion, unlink() is the function for deleting files in PHP. There is no built in PHP function called delete(). If you’re looking to delete a directory in PHP, … Read more

This tutorial will explain how to upload one or multiple files from the web browser to the server using PHP. Code examples are included, including the code for limiting file size and type. Being able to have your users upload files to your app has become expected functionality in most web apps. Photos, filled out PDF forms, videos, recordings – any kind of file can be uploaded, and the process is relatively straight forward. PHP provides all of the required tools for file uploading and … Read more

This article outlines the PHP_SELF attribute of the $_SERVER system information variable and why you should never, ever use it. What is _$SERVER? Check out our full article on $_SERVER here – but in short, it’s a variable containing an array with information about your PHP environment – including server and request details that are quite sensitive and shouldn’t be publicly accessible. What is $_SERVER[‘PHP_SELF’] ? $_SERVER[‘PHP_SELF’] contains the full path to the PHP script being executed, including any query parameters. This allows the party making the request to include arbitrary data. Displaying data … Read more

This article will explain what the $_SERVER superglobal variable is in the PHP programming language. What is a ‘Superglobal’ Variable? A superglobal variable is a variable that is available to all scripts in all scopes in PHP. It is available from within any file, class, or function. What is the $_SERVER Superglobal Variable? The $_SERVER superglobal contains information about the server and execution environment PHP is running in/on. It contains information on the request made to the web server, file paths, and other information. It will provide little to no info … Read more

Here’s a quick trick for validating JSON in PHP – with a reusable function, you can copy and paste it into your own project. JSON has pretty much become the standard format for transferring data between applications on the internet. So if you’re building an API to be consumed by others or just building a backend for your app, you’ll be sending and receiving a lot of JSON data. But, you can never trust the request – the data coming into your application. Users enter bad data. Hackers deliberately enter bad … Read more