Php Naming Conventions Variables

                  Php Naming Conventions Variables

Php Naming Conventions Variables :

1.       A variable value can have alpha numeric characters and underscore.

2.       A variable name should start with a letter and underscore.

3.       No space is allowed between the characters of a variable name.

4.       Variable names are case sensitive.

5.       It is advisable not to use the reserved keywords of php as a variable name.

Ex : $firstName

       $last_name

       $_age

6.       Dot operator (.) operator is the concatenation operator used in php.

<?php

$firstName = “india”;

$last_name= “tech”;

$_age = 25;

Echo $firstName.”—“.$last_name.”—“.$_age.”<br>”;

Echo “firstName--$last_name--$_age<br>”;

Echo ‘$firstName--$last_name--$_age<br>’;

?>

Note :  If we use a variable in double quotes(“ “) self expansion of the variable will happen where the memory usage is more.

So we should not use a variable in double quotes(“ “).

Php Naming Conventions Variables