PHP — Hello, World!

print

print is not a function but a language construct. Its argument is the expression following the print keyword, and is not delimited by parentheses.

The major differences to echo are that print only accepts a single argument and always returns 1 .

Parameters

The expression to be output. Non-string values will be coerced to strings, even when the strict_types directive is enabled.

Return Values

Examples

Example #1 print examples

print «print does not require parentheses.» ;

// No newline or space is added; the below outputs «helloworld» all on one line
print «hello» ;
print «world» ;

print «This string spans
multiple lines. The newlines will be
output as well» ;

print «This string spans\nmultiple lines. The newlines will be\noutput as well.» ;

// The argument can be any expression which produces a string
$foo = «example» ;
print «foo is $foo » ; // foo is example

$fruits = [ «lemon» , «orange» , «banana» ];
print implode ( » and » , $fruits ); // lemon and orange and banana

// Non-string expressions are coerced to string, even if declare(strict_types=1) is used
print 6 * 7 ; // 42

// Because print has a return value, it can be used in expressions
// The following outputs «hello world»
if ( print «hello» ) echo » world» ;
>

// The following outputs «true»
( 1 === 1 ) ? print ‘true’ : print ‘false’ ;
?>

Notes

Note: Using with parentheses

Surrounding the argument to print with parentheses will not raise a syntax error, and produces syntax which looks like a normal function call. However, this can be misleading, because the parentheses are actually part of the expression being output, not part of the print syntax itself.

print( «hello» );
// also outputs «hello», because («hello») is a valid expression

print( 1 + 2 ) * 3 ;
// outputs «9»; the parentheses cause 1+2 to be evaluated first, then 3*3
// the print statement sees the whole expression as one argument

if ( print( «hello» ) && false ) print » — inside if» ;
>
else print » — inside else» ;
>
// outputs » — inside if»
// the expression («hello») && false is first evaluated, giving false
// this is coerced to the empty string «» and printed
// the print construct then returns 1, so code in the if block is run
?>

When using print in a larger expression, placing both the keyword and its argument in parentheses may be necessary to give the intended result:

if ( (print «hello» ) && false ) print » — inside if» ;
>
else print » — inside else» ;
>
// outputs «hello — inside else»
// unlike the previous example, the expression (print «hello») is evaluated first
// after outputting «hello», print returns 1
// since 1 && false is false, code in the else block is run

print «hello » && print «world» ;
// outputs «world1»; print «world» is evaluated first,
// then the expression «hello » && 1 is passed to the left-hand print

(print «hello » ) && (print «world» );
// outputs «hello world»; the parentheses force the print expressions
// to be evaluated before the &&
?>

Note: Because this is a language construct and not a function, it cannot be called using variable functions, or named arguments.

See Also

• echo — Output one or more strings
• printf() — Output a formatted string
• flush() — Flush system output buffer
• Ways to specify literal strings

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PHP Hello World

Summary: in this tutorial, you’ll learn how to execute a script that outputs the Hello, World! message on the web browser and command line.

PHP Hello World on the web browser

First, open the folder htdocs under the xampp folder. Typically, it locates at C:\xampp\htdocs .

Second, create a new folder called helloworld .

Third, create a new file called index.php under the helloworld folder and place the following code in the file:

 "en"> "UTF-8"> "viewport" content="width=device-width, initial-scale=1.0">   
 echo 'Hello, World!'; ?>
  Code language: PHP (php)

The code in the index.php file looks like a regular HTML document except the part .

The code between the opening tag is PHP:

 echo 'Hello, World!'; ?>Code language: HTML, XML (xml)

This PHP code prints out the Hello, World message inside the h1 tag using the echo statement:

When PHP executes the index.php file, it evaluates the code and returns the Hello, World! message.

Fourth, launch a web browser and open the URL:

http://localhost:8080/helloworld/Code language: JavaScript (javascript)

If you see the following on the web browser, then you’ve successfully executed the first PHP script:

If you view the soure code of the page, you’ll see the following HTML code:

html> html lang="en"> head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1.0"> title>PHP - Hello, World! title> head> body> h1>Hello, World! h1> body> html>Code language: HTML, XML (xml)

PHP Hello World on the command line

First, open the Command Prompt on Windows or Terminal on macOS or Linux.

Second, navigate to the folder c:\xampp\htdocs\helloworld\.

Third, type the following command to execute the index.php file:

c:\xampp\htdocs\helloworld>php index.phpCode language: CSS (css)

You’ll see the HTML output:

html lang="en"> head> meta charset="UTF-8"> title>PHP - Hello, World! title> head> body> h1>Hello, World! h1> body> html>Code language: HTML, XML (xml)

Since the terminal doesn’t know how to render HTML to web, it just shows the pure HTML code.

To simplify the output, you can use the following code in the index.php :

 echo 'Hello, World!';Code language: HTML, XML (xml)

If you execute the script again:

c:\xampp\htdocs\helloworld>php index.phpCode language: CSS (css)

and you’ll see the following output:

When you embed PHP code with HTML, you need to have the opening tag . However, if the file contains only PHP code, you don’t need to the closing tag ?> like the index.php above.

Summary

• Place the PHP code between to mix PHP code with HTML.
• Use the echo construct to output one or more strings to the screen.

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Mastering PHP Development: Learn How to Print ‘Hello World’ with Examples and Tips

Begin your journey towards mastering PHP development by learning how to print ‘Hello World’ in PHP. This blog post covers the basic syntax and important tips to get you started. Follow our examples and best practices to optimize PHP performance and avoid common issues.

• Using the echo statement
• Other output statements in PHP
• How To Run PHP Hello World Program
• Embedding PHP in HTML
• Running PHP programs
• Additional tips and tricks
• Other examples of simple code for printing ‘Hello World’ in PHP
• Conclusion
• How do you print Hello World in PHP?
• How does PHP code start?
• How to run first program in PHP?
• Which one of the following is the correct PHP to output Hello?

If you are new to programming, then you may have heard of the term “Hello World” program. It is a simple program that outputs the message “Hello World” on the screen. This program is often used as a starting point for learning a new programming language, including PHP. In this blog post, we will cover the basic syntax for printing “Hello World” in PHP, as well as some important and helpful points to help you get started.

Using the echo statement

The easiest way to print “Hello World” in PHP is by using the echo statement, which is used to output text in PHP. The basic syntax for printing “Hello World” in PHP is:

It is important to note that the echo statement does not require a semicolon at the end of the line, but it is considered a best practice to include it.

You can also add variables to the echo statement using the concatenation operator ( . ), such as:

$name = "John Doe"; echo "My name is " . $name; 

This will output “My name is John Doe”.

Other output statements in PHP

In addition to the echo statement, there are other statements that can be used to output text in PHP. The print statement is similar to the echo statement but has some differences. For example, print takes only one argument, whereas echo can take multiple arguments.

The printf statement allows you to format the output text. It is similar to the printf function in C programming language. Here is an example:

$num = 10; printf("The value of num is %d", $num); 

This will output “The value of num is 10”.

How To Run PHP Hello World Program

This hello world program in PHP is a very simple program and widely used by the programmers Duration: 7:01

Embedding PHP in HTML

PHP code can be embedded within HTML web pages. The PHP script starts with . Here is an example:

When this code is executed, it will display “Hello World” on the web page.

Running PHP programs

To run a PHP program, you need a server that can interpret PHP code. You can open any web browser and enter the URL for the program. The PHP script must be saved with a .php extension to be recognized by the server.

You can also run PHP code from the command line using the PHP interpreter. Here is an example:

Additional tips and tricks

PHP has various data types such as strings, integers, and arrays. You can learn more about them in the PHP documentation.

PHP also has control structures such as if-else statements and loops. These are used to control the flow of the program. Again, you can learn more about them in the PHP documentation.

PHP has various frameworks such as Laravel and CodeIgniter that make development easier. These frameworks provide a set of libraries and tools that can be used to build web applications quickly.

Best practices for PHP development include using a version control system and following coding standards. A version control system allows you to keep track of changes to your code, while coding standards ensure that your code is readable and maintainable.

common issues in php development include errors and vulnerabilities. To avoid these issues, it is important to use secure coding practices and to keep your PHP installation up to date.

Tips for optimizing PHP performance include caching and using a Content Delivery Network (CDN). Caching involves storing data in memory to reduce the time it takes to retrieve it. A CDN is a network of servers that can deliver content faster by caching it closer to the user.

Other examples of simple code for printing ‘Hello World’ in PHP

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In Php as proof, hello world php

Conclusion

Printing “Hello World” in PHP is a simple and commonly used program for beginners. The echo statement is used to output text in PHP. PHP code can be embedded within HTML web pages and run from the command line. By following the tips and tricks mentioned in this post, you can start your journey towards mastering PHP development.

Frequently Asked Questions — FAQs

What is PHP and why is it important for web development?

PHP is a popular programming language used for web development. It allows developers to create dynamic and interactive websites with ease. It is important to learn PHP as it is widely used by many websites and can help you land a job in the web development industry.

What is the echo statement in PHP and how is it used to print text?

The echo statement is used to output text in PHP. It is a language construct and does not require parentheses. To print «Hello World» in PHP, you can use the basic syntax: `echo «Hello World»;`

How can I embed PHP in HTML web pages?

You can embed PHP code within HTML web pages by using the PHP script tags: «. The PHP code can be placed anywhere within the HTML page.

What are some best practices for PHP development?

Some best practices for PHP development include using a version control system, following coding standards, and using a PHP framework to make development easier.

How can I optimize PHP performance?

You can optimize PHP performance by using caching, using a Content Delivery Network (CDN), and minimizing database queries.

What are some common issues in PHP development and how can I avoid them?

Common issues in PHP development include errors and vulnerabilities. You can avoid these issues by following best practices, staying up to date with security patches, and using a PHP framework that has built-in security features.

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