List of Reserved Words
Содержание
The following is a listing of predefined identifiers in PHP. None of the identifiers listed here should be used as identifiers in any of your scripts. These lists include keywords and predefined variable, constant, and class names. These lists are neither exhaustive or complete.
List of Keywords
These words have special meaning in PHP. Some of them represent things which look like functions, some look like constants, and so on--but they're not, really: they are language constructs. You cannot use any of the following words as constants, class names, function or method names. Using them as variable names is generally OK, but could lead to confusion.
| and | or | xor | __FILE__ | exception (PHP 5) |
| __LINE__ | array() | as | break | case |
| class | const | continue | declare | default |
| die() | do | echo() | else | elseif |
| empty() | enddeclare | endfor | endforeach | endif |
| endswitch | endwhile | eval() | exit() | extends |
| for | foreach | function | global | if |
| include() | include_once() | isset() | list() | new |
| print() | require() | require_once() | return() | static |
| switch | unset() | use | var | while |
| __FUNCTION__ | __CLASS__ | __METHOD__ | final (as of PHP 5) | php_user_filter (as of PHP 5) |
| interface (as of PHP 5) | implements (as of PHP 5) | instanceof (as of PHP 5) | public (as of PHP 5) | private (as of PHP 5) |
| protected (as of PHP 5) | abstract (as of PHP 5) | clone (as of PHP 5) | try (as of PHP 5) | catch (as of PHP 5) |
| throw (as of PHP 5) | cfunction (PHP 4 only) | old_function (PHP 4 only) | this (as of PHP 5) | final (as of PHP 5) |
| __NAMESPACE__ (as of PHP 5.3) | namespace (as of PHP 5.3) | goto (PHP 6 only) | __DIR__ (as of PHP 5.3) |
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Коментарии
[Editorial note: parent and self are reserved class names. Functions and constants with their names can be declared, but not userspace classes]
true, false and null are not listed because they are globally-defined constants, not reserved words.
No idea about parent or self, though.