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<title>List of Keywords</title>
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<h2 class="title">List of Keywords</h2>
<p class="simpara">
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.
</p>
<table class="doctable table">
<caption><strong>PHP Keywords</strong></caption>
<tbody class="tbody">
<tr>
<td>
<span class="function"><a href="function.halt-compiler.html" class="function">__halt_compiler()</a></span>
</td>
<td>
<a href="language.oop5.abstract.html" class="link">abstract</a>
</td>
<td>
<a href="language.operators.logical.html" class="link">and</a>
</td>
<td>
<span class="function"><a href="function.array.html" class="function">array()</a></span>
</td>
<td>
<a href="control-structures.foreach.html" class="link">as</a>
</td>
</tr>
<tr>
<td>
<a href="control-structures.break.html" class="link">break</a>
</td>
<td>
<a href="language.types.callable.html" class="link">callable</a> (as of PHP 5.4)
</td>
<td>
<a href="control-structures.switch.html" class="link">case</a>
</td>
<td>
<a href="language.exceptions.html" class="link">catch</a>
</td>
<td>
<a href="keyword.class.html" class="link">class</a>
</td>
</tr>
<tr>
<td>
<a href="language.oop5.cloning.html" class="link">clone</a>
</td>
<td>
<a href="language.oop5.constants.html" class="link">const</a>
</td>
<td>
<a href="control-structures.continue.html" class="link">continue</a>
</td>
<td>
<a href="control-structures.declare.html" class="link">declare</a>
</td>
<td>
<a href="control-structures.switch.html" class="link">default</a>
</td>
</tr>
<tr>
<td>
<span class="function"><a href="function.die.html" class="function">die()</a></span>
</td>
<td>
<a href="control-structures.do.while.html" class="link">do</a>
</td>
<td>
<span class="function"><a href="function.echo.html" class="function">echo</a></span>
</td>
<td>
<a href="control-structures.else.html" class="link">else</a>
</td>
<td>
<a href="control-structures.elseif.html" class="link">elseif</a>
</td>
</tr>
<tr>
<td>
<span class="function"><a href="function.empty.html" class="function">empty()</a></span>
</td>
<td>
<a href="control-structures.declare.html" class="link">enddeclare</a>
</td>
<td>
<a href="control-structures.alternative-syntax.html" class="link">endfor</a>
</td>
<td>
<a href="control-structures.alternative-syntax.html" class="link">endforeach</a>
</td>
<td>
<a href="control-structures.alternative-syntax.html" class="link">endif</a>
</td>
</tr>
<tr>
<td>
<a href="control-structures.alternative-syntax.html" class="link">endswitch</a>
</td>
<td>
<a href="control-structures.alternative-syntax.html" class="link">endwhile</a>
</td>
<td>
<span class="function"><a href="function.eval.html" class="function">eval()</a></span>
</td>
<td>
<span class="function"><a href="function.exit.html" class="function">exit()</a></span>
</td>
<td>
<a href="keyword.class.html" class="link">extends</a>
</td>
</tr>
<tr>
<td>
<a href="language.oop5.final.html" class="link">final</a>
</td>
<td>
<a href="language.exceptions.html" class="link">finally</a> (as of PHP 5.5)
</td>
<td>
<a href="control-structures.for.html" class="link">for</a>
</td>
<td>
<a href="control-structures.foreach.html" class="link">foreach</a>
</td>
<td>
<a href="functions.user-defined.html" class="link">function</a>
</td>
</tr>
<tr>
<td>
<a href="language.variables.scope.html" class="link">global</a>
</td>
<td>
<a href="control-structures.goto.html" class="link">goto</a> (as of PHP 5.3)
</td>
<td>
<a href="control-structures.if.html" class="link">if</a>
</td>
<td>
<a href="language.oop5.interfaces.html" class="link">implements</a>
</td>
<td>
<span class="function"><a href="function.include.html" class="function">include</a></span>
</td>
</tr>
<tr>
<td>
<span class="function"><a href="function.include-once.html" class="function">include_once</a></span>
</td>
<td>
<a href="language.operators.type.html" class="link">instanceof</a>
</td>
<td>
<a href="language.oop5.traits.html#language.oop5.traits.conflict" class="link">insteadof</a> (as of PHP 5.4)
</td>
<td>
<a href="language.oop5.interfaces.html" class="link">interface</a>
</td>
<td>
<span class="function"><a href="function.isset.html" class="function">isset()</a></span>
</td>
</tr>
<tr>
<td>
<span class="function"><a href="function.list.html" class="function">list()</a></span>
</td>
<td>
<a href="language.namespaces.html" class="link">namespace</a> (as of PHP 5.3)
</td>
<td>
<a href="keyword.class.html" class="link">new</a>
</td>
<td>
<a href="language.operators.logical.html" class="link">or</a>
</td>
<td>
<span class="function"><a href="function.print.html" class="function">print</a></span>
</td>
</tr>
<tr>
<td>
<a href="language.oop5.visibility.html" class="link">private</a>
</td>
<td>
<a href="language.oop5.visibility.html" class="link">protected</a>
</td>
<td>
<a href="language.oop5.visibility.html" class="link">public</a>
</td>
<td>
<span class="function"><a href="function.require.html" class="function">require</a></span>
</td>
<td>
<span class="function"><a href="function.require-once.html" class="function">require_once</a></span>
</td>
</tr>
<tr>
<td>
<span class="function"><a href="function.return.html" class="function">return</a></span>
</td>
<td>
<a href="language.variables.scope.html" class="link">static</a>
</td>
<td>
<a href="control-structures.switch.html" class="link">switch</a>
</td>
<td>
<a href="language.exceptions.html" class="link">throw</a>
</td>
<td>
<a href="language.oop5.traits.html" class="link">trait</a> (as of PHP 5.4)
</td>
</tr>
<tr>
<td>
<a href="language.exceptions.html" class="link">try</a>
</td>
<td>
<span class="function"><a href="function.unset.html" class="function">unset()</a></span>
</td>
<td>
<a href="language.namespaces.html" class="link">use</a>
</td>
<td>
<a href="keyword.class.html" class="link">var</a>
</td>
<td>
<a href="control-structures.while.html" class="link">while</a>
</td>
</tr>
<tr>
<td>
<a href="language.operators.logical.html" class="link">xor</a>
</td>
<td>
<a href="language.generators.html" class="link">yield</a> (as of PHP 5.5)
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
</tbody>
</table>
<table class="doctable table">
<caption><strong>Compile-time constants</strong></caption>
<tbody class="tbody">
<tr>
<td>
<a href="language.constants.predefined.html" class="link">__CLASS__</a>
</td>
<td>
<a href="language.constants.predefined.html" class="link">__DIR__</a> (as of PHP 5.3)
</td>
<td>
<a href="language.constants.predefined.html" class="link">__FILE__</a>
</td>
<td>
<a href="language.constants.predefined.html" class="link">__FUNCTION__</a>
</td>
<td>
<a href="language.constants.predefined.html" class="link">__LINE__</a>
</td>
<td>
<a href="language.constants.predefined.html" class="link">__METHOD__</a>
</td>
</tr>
<tr>
<td>
<a href="language.namespaces.nsconstants.html" class="link">__NAMESPACE__</a> (as of PHP 5.3)
</td>
<td>
<a href="language.constants.predefined.html" class="link">__TRAIT__</a> (as of PHP 5.4)
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
</tbody>
</table>
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