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<title>List of other reserved words</title>
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<h2 class="title">List of other reserved words</h2>
<p class="simpara">
The following words cannot be used to name a class, interface or trait, and
they are also prohibited from being used in namespaces.
</p>
<p class="para">
<table class="doctable table">
<caption><strong>Reserved words</strong></caption>
<tbody class="tbody">
<tr>
<td>
int (as of PHP 7)
</td>
<td>
float (as of PHP 7)
</td>
<td>
bool (as of PHP 7)
</td>
<td>
string (as of PHP 7)
</td>
</tr>
<tr>
<td>
true (as of PHP 7)
</td>
<td>
false (as of PHP 7)
</td>
<td>
null (as of PHP 7)
</td>
<td>
void (as of PHP 7.1)
</td>
</tr>
<tr>
<td>
iterable (as of PHP 7.1)
</td>
<td>
object (as of PHP 7.2)
</td>
</tr>
</tbody>
</table>
</p>
<p class="para">
The following list of words have had soft reservations placed on them.
Whilst they may still be used as class, interface, and trait names (as well
as in namespaces), usage of them is highly discouraged since they may be
used in future versions of PHP.
</p>
<p class="para">
<table class="doctable table">
<caption><strong>Soft reserved words</strong></caption>
<tbody class="tbody">
<tr>
<td>
resource (as of PHP 7)
</td>
<td>
mixed (as of PHP 7)
</td>
<td>
numeric (as of PHP 7)
</td>
<td>
</td>
</tr>
</tbody>
</table>
</p>
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