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> PHP has a single type operator: <VAR
CLASS="literal"
>instanceof</VAR
>.
<VAR
CLASS="literal"
>instanceof</VAR
> is used to determine whether a given
object is of a specified <A
HREF="language.oop.html"
>object class</A
>.
</P
><P
> The <VAR
CLASS="literal"
>instanceof</VAR
> operator was introduced in PHP 5.
Before this time <A
HREF="function.is-a.html"
><B
CLASS="function"
>is_a()</B
></A
> was used but
<A
HREF="function.is-a.html"
><B
CLASS="function"
>is_a()</B
></A
> has since been deprecated in favor of
<VAR
CLASS="literal"
>instanceof</VAR
>.
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><PRE
CLASS="programlisting"
><?php
class A { }
class B { }
$thing = new A;
if ($thing instanceof A) {
echo 'A';
}
if ($thing instanceof B) {
echo 'B';
}
?></PRE
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><P
> As <VAR
CLASS="varname"
>$thing</VAR
> is an <A
HREF="language.types.object.html"
><B
CLASS="type"
>object</B
></A
> of type A, but
not B, only the block dependent on the A type will be executed:
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> See also <A
HREF="function.get-class.html"
><B
CLASS="function"
>get_class()</B
></A
> and
<A
HREF="function.is-a.html"
><B
CLASS="function"
>is_a()</B
></A
>.
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