PHP MYSQL -Variables, Data Types - 4
PHP Variables
PHP Variables are "containers" for storing information.
A variable can have a short name (like m and n) or a more descriptive name (age, carname, total_volume).
Rules for PHP variables:
- A variable starts with the $ sign, followed by the name of the variable
- A variable name must start with a letter or the underscore character
- A variable name cannot start with a number
- A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
- Variable names are case-sensitive ($id and $ID are two different variables)
Eg: $student_name
$s1
$s2
PHP Data Types
Variables can store data of different types, and different data types can do different things.
PHP supports the following data types:
- String
- Integer
- Float (floating point numbers - also called double)
- Boolean
- Array
- Object
- NULL
- Resource
Ex1 :
<?php
$str = "Vesrn";
echo $str;
?>
Ex2
<?php
$str1 = "Vesrn";
$str2 = "Technologies";
echo $str1.$str2;
?>
Ex3:
<?php
$x = 10;
$y = 20;
echo $x+$y;
?>
Ex4:
<?php
$rank = 1;
echo "Vesrn Technologies is always in $rank";
?>