Difference between revisions of "Variables in PHP"
From OdleWiki
| Line 11: | Line 11: | ||
#are case-sensitive | #are case-sensitive | ||
| − | ===Acceptable Variable Names=== | + | ===Examples of Acceptable Variable Names=== |
| − | + | <code> | |
| − | < | + | $var<br /> |
| − | + | $_var<br /> | |
| − | + | $_Var<br /> | |
| − | + | >$VAR<br /> | |
| − | + | $VAR_001<br /> | |
| − | + | </code> | |
| − | |||
| − | |||
| − | |||
This is not a comprehensive list, merely examples. | This is not a comprehensive list, merely examples. | ||
| − | ===Unacceptable Variable Names=== | + | ===Examples of Unacceptable Variable Names=== |
| − | < | + | <code>$var*</code> (Variable names may only contain letters, numbers, and underscores.)<br /> |
| − | < | + | <code>$var #1</code> (Variable names may not contain # or spaces.)<br /> |
| − | < | + | <code>var$</code> (Variables names must '''begin''' with a dollar sign.) |
| Line 40: | Line 37: | ||
To assign a value to a variable, use a single equal sign (=) | To assign a value to a variable, use a single equal sign (=) | ||
| − | < | + | <code>$var = "Hello, world."</code> |
Revision as of 17:16, 31 July 2012
This page describes documentation valid for PHP 4 and PHP 5.
Contents
Basics
Variables in PHP:
- always begin with a dollar sign ($)
- starts with a letter or underscore (_)
- may contain any number of letters, numbers, and underscores
- are case-sensitive
Examples of Acceptable Variable Names
$var
$_var
$_Var
>$VAR
$VAR_001
This is not a comprehensive list, merely examples.
Examples of Unacceptable Variable Names
$var* (Variable names may only contain letters, numbers, and underscores.)
$var #1 (Variable names may not contain # or spaces.)
var$ (Variables names must begin with a dollar sign.)
Types of Variables
Assigning Values to Variables
To assign a value to a variable, use a single equal sign (=)
$var = "Hello, world."
