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.
As of PHP
7.0.0 these keywords are allowed as property, constant, and method names of
classes, interfaces and traits, except that class may not be used as
constant name.
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PHP Keywords
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||||
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__halt_compiler()
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abstract
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and
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array()
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as
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break
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callable (as of PHP 5.4)
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case
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catch
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class
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clone
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const
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continue
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declare
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default
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die()
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do
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echo
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else
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elseif
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empty()
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enddeclare
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endfor
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endforeach
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endif
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endswitch
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endwhile
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eval()
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exit()
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extends
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final
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finally (as of PHP 5.5)
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for
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foreach
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function
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global
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goto (as of PHP 5.3)
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if
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implements
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include
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include_once
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instanceof
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insteadof (as of PHP 5.4)
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interface
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isset()
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list()
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namespace (as of PHP 5.3)
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new
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or
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print
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private
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protected
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public
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require
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require_once
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return
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static
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switch
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throw
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trait (as of PHP 5.4)
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try
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unset()
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use
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var
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while
|
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xor
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yield (as of PHP 5.5)
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Compile-time constants
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|||||
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__CLASS__
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__DIR__ (as of PHP 5.3)
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__FILE__
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__FUNCTION__
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__LINE__
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__METHOD__
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__NAMESPACE__ (as of PHP 5.3)
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__TRAIT__ (as of PHP 5.4)
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