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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<br />
+
$var
$_var<br />
+
$_var
$_Var<br />
+
$_Var
>$VAR<br />
+
$VAR
$VAR_001<br />
+
$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

Php-med-trans.png

This page describes documentation valid for PHP 4 and PHP 5.

Basics

Variables in PHP:

  1. always begin with a dollar sign ($)
  2. start with a letter or underscore (_)
  3. may contain any number of letters, numbers, and underscores
  4. 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."