Difference between revisions of "Variables in PHP"
From OdleWiki
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===Examples of Acceptable Variable Names=== | ===Examples of Acceptable Variable Names=== | ||
| − | < | + | <pre> |
$var<br /> | $var<br /> | ||
$_var<br /> | $_var<br /> | ||
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>$VAR<br /> | >$VAR<br /> | ||
$VAR_001<br /> | $VAR_001<br /> | ||
| − | </ | + | </pre> |
This is not a comprehensive list, merely examples. | This is not a comprehensive list, merely examples. | ||
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===Examples of Unacceptable Variable Names=== | ===Examples of Unacceptable Variable Names=== | ||
| − | < | + | <pre>$var*</pre> (Variable names may only contain letters, numbers, and underscores.)<br /> |
| − | < | + | <pre>$var #1</pre> (Variable names may not contain # or spaces.)<br /> |
| − | < | + | <pre>var$</pre> (Variables names must '''begin''' with a dollar sign.) |
Revision as of 16:41, 2 August 2012
This page describes documentation valid for PHP 4 and PHP 5.
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<br /> $_var<br /> $_Var<br /> >$VAR<br /> $VAR_001<br />
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."
