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Difference between revisions of "Variables in PHP"

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[[Category:PHP]]
 
[[Category:PHP]]
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== Basics ==
 
== Basics ==
  
 
Variables in PHP:
 
Variables in PHP:
  
#always begin with a dollar sign ($)
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*are always preceded by a dollar sign (<span class="mono">$</span>)
#starts with a letter or underscore (_)
+
*start with a letter or underscore (<span class="mono">_</span>)
#may contain any number of letters, numbers, and underscores
+
*may contain any number of letters, numbers, and underscores
#are case-sensitive
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*are case-sensitive
  
 
===Examples of Acceptable Variable Names===
 
===Examples of Acceptable Variable Names===
<code>
+
<pre>
$var<br />
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$var
$_var<br />
+
$_var
$_Var<br />
+
$_Var
>$VAR<br />
+
$VAR
$VAR_001<br />
+
$VAR_001
</code>
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</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===
  
<code>$var*</code> (Variable names may only contain letters, numbers, and underscores.)<br />
+
<pre>$var*</pre> (Variable names may only contain letters, numbers, and underscores.)<br />
  
<code>$var #1</code> (Variable names may not contain # or spaces.)<br />
+
<pre>$var #1</pre> (Variable names may not contain # or spaces.)<br />
 
 
<code>var$</code> (Variables names must '''begin''' with a dollar sign.)
 
  
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<pre>var$</pre> (Variables names must '''begin''' with a dollar sign.)
  
 
==Types of Variables==
 
==Types of Variables==
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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>$var = "Hello, world."</code>
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<pre>$var = "Hello, world."</pre>

Latest revision as of 18:02, 8 July 2017

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Needs Attention
This article needs attention; however, it is not necessarily a stub or an orphan.

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

Basics

Variables in PHP:

  • are always preceded by 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."