Difference between revisions of "Variables in PHP"
From OdleWiki
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===Examples of Acceptable Variable Names=== | ===Examples of Acceptable Variable Names=== | ||
<pre> | <pre> | ||
− | $var | + | $var |
− | $_var | + | $_var |
− | $_Var | + | $_Var |
− | + | $VAR | |
− | $VAR_001 | + | $VAR_001 |
</pre> | </pre> | ||
− | This is not a comprehensive list, merely examples. | + | This is not a comprehensive list, merely examples. |
===Examples of Unacceptable Variable Names=== | ===Examples of Unacceptable Variable Names=== |
Revision as of 23:24, 10 December 2013
Contents
Basics
Variables in PHP:
- always begin with a dollar sign ($)
- start 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."