PHP Variables

A PHP Variable is simply an element or data item that may take on more than one value during the run-time of a program.

In other words, a PHP variable store a value that can change, depending on conditions or on information passed to the program.

PHP Variables Rules:

  • In PHP, variable names are case-sensitive.
  • Variables in PHP are represented by a dollar sign followed by the name of the variable.
  • A valid variable name starts with a letter or underscores, followed by any number of letters, numbers, or underscores.
  • After declaring a variable it can be reused throughout the code.
  • A variable does not need to be declared before adding a value to it.
  • PHP automatically converts the variable to the correct data type, depending on its value.
  • The assignment operator (=) used to assign value to a variable.

PHP Variables Example:

$content = "Hello PHP!";
$a = 10;
$_msg = 'Hello again';

echo $content;
echo "<br>".$a;
echo "<br>".$_msg;
Tutorials Class - Output Window

Hello PHP!
Hello again

Congratulations! Chapter Finished. Learn more about the similar topics:
Exercises & Assignments
Write a program to print “Hello World” using echo
Write a program to print “Hello PHP” using variable
Write a program to print a string using echo+variable.
Write a program to print two variables in single echo
Interview Questions & Answers
How to check if a variable is empty in PHP?
Is PHP a case sensitive language?
What are the different data types in PHP?