PHP Variables
Definition of PHP Variables
A PHP variables name cannot start with a number. A variable name can only contain alpha–numeric characters and underscores (A-z, 0-9, and _ )
First of all Variable names are case-sensitive ($male and $MALE are two different variables)
- We know that very well, variables always stored the data.
- A variable is a temporary storage that is used to store data temporarily.
- In PHP, a variable is declared using $ sign followed by a variable name. i.e. $country.
Example:
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$variablename=value; |
PHP Variable: Declaring string, integer, and float
the example to store string, integer and float values in PHP variables.
File: example1.php
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<?php $str="Welcome"; $x=500; $y=77.6; echo "string is: $str <br/>"; echo "integer is: $x <br/>"; echo "float is: $y <br/>"; ?> |
Output:
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string is: Welcome integer is: 500 float is: 77.6 |
PHP Variable: Sum of two variables
File: example2.php
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<?php $x=25; $y=61; $z=$x+$y; echo $z; ?> |
Output:
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86 |
PHP Variable: case sensitive
therefore, variable names are case sensitive. So variable name “color” is different from Color, COLOR, COLor etc.
File: example3.php
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<?php $color="red"; echo "My Bike is " . $color . "<br>"; echo "My Car is " . $COLOR . "<br>"; echo "My House is " . $coLOR . "<br>"; ?> |
Note:
- finally, The PHP variables start with the $ sign, (i.e. $Car) followed by the name of the variable and In PHP name always must start with a letter or the underscore character only but the name can not start with a number.
Resource
PHP.Net
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