PHP Reserved Words
Key Words
| abstract (as of PHP 5) | and | array() | as | break |
| case | catch(as of PHP 5) | cfunction (PHP 4 only) | class | clone (as of PHP 5) |
| const | continue | declare | default | do |
| else | elseif | enddeclare | endfor | endforeach |
| endif | endswitch | endwhile | extends | final(as of PHP 5) |
| for | foreach | function | global | goto (as of PHP 5.3) |
| if | implements (as of PHP 5) | interface (as of PHP 5) | instanceof (as of PHP 5) | – |
| namespace (as of PHP 5.3) | new | old_function (PHP 4 only) | or | private (as of PHP 5) |
| protected (as of PHP 5) | public (as of PHP 5) | static | switch | throw (as of PHP 5) |
| try (as of PHP 5) | use | var | while | xor |
Constants
| __CLASS__ | __DIR__ (as of PHP 5.3) | __FILE__ | __LINE__ | __FUNCTION__ | __METHOD__ |
| __NAMESPACE__ (as of PHP 5.3) | – | – | – | – | – |
Language Construct
| die() | echo() | empty() | exit() | eval() |
| include() | include_once() | isset() | list() | require() |
| require_once() | return() | print() | unset() | – |
A language construct is a part of a program that may be formed from one or more lexical tokens.
For example, print is a language construct.
<?php print 'language construct'; ?>
is the same as:
<?php
print('language construct');
?>
Predefine Variables
| __COOKIE | __ENV | __GET | __POST | __REQUEST | __SERVER | __SESSION |