Difference between revisions of "Variables in PHP"
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{{Template:PHP4 5}} | {{Template:PHP4 5}} | ||
[[Category:PHP]] | [[Category:PHP]] | ||
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== Basics == | == Basics == | ||
Variables in PHP: | Variables in PHP: | ||
| − | + | *are always preceded by a dollar sign (<span class="mono">$</span>) | |
| − | + | *start with a letter or underscore (<span class="mono">_</span>) | |
| − | + | *may contain any number of letters, numbers, and underscores | |
| − | + | *are case-sensitive | |
===Examples of Acceptable Variable Names=== | ===Examples of Acceptable Variable Names=== | ||
| − | < | + | <pre> |
| − | $var | + | $var |
| − | $_var | + | $_var |
| − | $_Var | + | $_Var |
| − | + | $VAR | |
| − | $VAR_001 | + | $VAR_001 |
| − | </ | + | </pre> |
| − | This is not a comprehensive list, merely examples. | + | This is not a comprehensive list, merely examples. |
===Examples of Unacceptable Variable Names=== | ===Examples of Unacceptable Variable Names=== | ||
| − | < | + | <pre>$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.) | ||
==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 (=) | ||
| − | < | + | <pre>$var = "Hello, world."</pre> |
Latest revision as of 18:02, 8 July 2017
This page describes documentation valid for PHP 4 and PHP 5.
Contents
Basics
Variables in PHP:
- are always preceded by a dollar sign ($)
- 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."
