The quotation marks delineate where the string begins and ends. The quotes that are on either side of Hello, World! were not output to the screen because they are used to tell PHP that this section of code contains a string. In this example, the string Hello, World! is also called an argument since it is a value that is passed to another part of the code, such as a construct or a function. The string value of Hello, World! was passed to the construct. PHP executed the line echo "Hello, World!" by calling the language construct echo. Let’s go over what the program did in more detail. Running the hello.php program that you just created will cause your terminal to produce the following output: Use the php command along with the name of the program file as follows:
With your “Hello, World!” program written, you’re ready to run the program. With that, you have written your “Hello, World!” program. Once you exit nano, you’ll return to your shell.
Any characters that are inside quotation marks are called a string.Īfter writing the program, hold down the CTRL key and press the X key to exit nano. īetween the echo and the is a sequence of characters - Hello, World! - that is enclosed in quotation marks. echo tells PHP to display or output whatever is included between echo and the ending semicolon. Its arguments are a list of expressions following the echo keyword, separated by commas and not delimited by parentheses. Let’s break down the different components of the code.Īll PHP code falls within a PHP Code Block, starting with. Once the text file opens up in the terminal window, type out the program: To write the “Hello, World!” program, start by opening a command-line text editor, such as nano, and create a new file: To set this up, follow the How to Install PHP 7.4 and Set Up a Local Development Environment for your operating system. You will need PHP installed as well as a local programming environment set up on your computer. You’ll also learn about opening and closing PHP code blocks within your code and using different types of comments in your code. This tutorial will walk you through writing a “Hello, World!” program in PHP. Serving as a complete first program for beginners and a good program to test systems and programming environments, “Hello, World!” illustrates the basic syntax of programming languages. The “Hello, World!” program is a classic and time-honored tradition in computer programming. The author selected Open Sourcing Mental Illness Ltd to receive a donation as part of the Write for DOnations program.
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