Руководство по PHP
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# Приложение K. List of Reserved Words

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.

Таблица K-1. PHP Keywords

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 (PHP 5) | php_user_filter (PHP 5)
interface (PHP 5) | implements (PHP 5) | extends | public (PHP 5) | private (PHP 5)
protected (PHP 5) | abstract (PHP 5) | clone (PHP 5) | try (PHP 5) | catch (PHP 5)
throw (PHP 5) | cfunction (PHP 4 only) | old_function (PHP 4 only) |  |

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Список псевдонимов функций | Уровень выше | Predefined Variables