Variables in PHP

In this tutorial, we will learn Variables in PHP. Variables are used to store data like to store string or number for example min_age=18. Value of variable can be changed several times throughout the code. It is so easy to define a variable in PHP just write $sign and then a variable name like this $min_age=18. You do not even need to mention the data type of variable. Because PHP will automatically choose the correct data type of variable according to the value stored in a variable.

Basic Things to keep in mind while creating Variables in PHP

  • All variables in PHP start with a $ sign, followed by the name of the variable.
  • A variable name must start with a letter or the underscore character _.
  • The variable name cannot start with a number.
  • Variable name in PHP can only contain alpha-numeric characters and underscores (A-z, 0-9, and _).
  • The variable name cannot contain spaces.

There are some rules which you should follow while defining and variable name. To initialize a variable you just need assignment operator (=) then write value of variable for example $min_age=18 or $name=”Mohit”.

Now we will check this basic example to understand Variables in PHP.

<?php 
$age=22;
$name="Mohit";
$city="Delhi";
$height=5.9;
 
echo "Hello ".$name." Your age is ".$age." You height is ".$height.", and You are from ".$city;

?>

Note! Please note I am using dot (.) symbol in the above example in echo to concatenate strings.

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