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Difference between revisions of "Variables in PHP"

From OdleWiki
Line 12: Line 12:
 
===Acceptable Variable Names===
 
===Acceptable Variable Names===
  
<nowiki>$var<br />
+
<nowiki>$var</nowiki><br />
  
$_var<br />
+
<nowiki>$_var</nowiki><br />
  
$_Var<br />
+
<nowiki>$_Va</nowiki>r<br />
  
$VAR<br />
+
<nowiki>$VAR</nowiki><br />
  
$VAR_001</nowiki>
+
<nowiki>$VAR_001</nowiki>
  
 
This is not a comprehensive list, merely examples.  
 
This is not a comprehensive list, merely examples.  

Revision as of 15:18, 30 July 2012

Basics

Variables in PHP:

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

Acceptable Variable Names

$var

$_var

$_Var

$VAR

$VAR_001

This is not a comprehensive list, merely examples.

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."