Sophie: php-manual-pt_BR-5.2.4-1mdv2008.1 noarch

php-manual-pt_BR-5.2.4-1mdv2008.1.noarch.rpm

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>is_callable</H1
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><P
>    (PHP 4 &#62;= 4.0.6, PHP 5)</P
>is_callable&nbsp;--&nbsp;
     Verify that the contents of a variable can be called as a function
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><A
NAME="AEN229922"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>is_callable</B
> ( mixed var [, bool syntax_only [, string &#38;callable_name]] )<BR
></BR
><P
>&#13;     Verify that the contents of a variable can be called as a function.
     This can check that a simple variable contains the name of a valid
     function, or that an array contains a properly encoded object and
     function name.
    </P
><P
>&#13;     The <CODE
CLASS="parameter"
>var</CODE
> parameter can be either the name of a function stored in
     a string variable, or an object and the name of a method within the
     object, like this: 
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    </P
><P
>&#13;     If the <CODE
CLASS="parameter"
>syntax_only</CODE
> argument is <TT
CLASS="constant"
><B
>TRUE</B
></TT
> the
     function only verifies that <CODE
CLASS="parameter"
>var</CODE
> might be a
     function or method. It will only reject simple variables that are
     not strings, or an array that does not have a valid structure to be
     used as a callback. The valid ones are supposed to have only 2
     entries, the first of which is an object or a string, and the
     second a string.
    </P
><P
>&#13;     The <CODE
CLASS="parameter"
>callable_name</CODE
> argument receives the
     "callable name".  In the example below it's
     "someClass:someMethod".  Note, however, that despite the
     implication that someClass::SomeMethod() is a callable static
     method, this is not the case.
    </P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">//&nbsp;&nbsp;How to check a variable to see if it can be called<br />//&nbsp;&nbsp;as a function.<br /><br />//<br />//&nbsp;&nbsp;Simple variable containing a function<br />//<br /><br /></font><font color="#007700">function </font><font color="#0000BB">someFunction</font><font color="#007700">() <br />{<br />}<br /><br /></font><font color="#0000BB">$functionVariable </font><font color="#007700">= </font><font color="#DD0000">'someFunction'</font><font color="#007700">;<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">is_callable</font><font color="#007700">(</font><font color="#0000BB">$functionVariable</font><font color="#007700">, </font><font color="#0000BB">false</font><font color="#007700">, </font><font color="#0000BB">$callable_name</font><font color="#007700">));&nbsp;&nbsp;</font><font color="#FF8000">// bool(true)<br /><br /></font><font color="#007700">echo </font><font color="#0000BB">$callable_name</font><font color="#007700">, </font><font color="#DD0000">"\n"</font><font color="#007700">;&nbsp;&nbsp;</font><font color="#FF8000">// someFunction<br /><br />//<br />//&nbsp;&nbsp;Array containing a method<br />//<br /><br /></font><font color="#007700">class </font><font color="#0000BB">someClass </font><font color="#007700">{<br /><br />&nbsp;&nbsp;function </font><font color="#0000BB">someMethod</font><font color="#007700">() <br />&nbsp;&nbsp;{<br />&nbsp;&nbsp;}<br /><br />}<br /><br /></font><font color="#0000BB">$anObject </font><font color="#007700">= new </font><font color="#0000BB">someClass</font><font color="#007700">();<br /><br /></font><font color="#0000BB">$methodVariable </font><font color="#007700">= array(</font><font color="#0000BB">$anObject</font><font color="#007700">, </font><font color="#DD0000">'someMethod'</font><font color="#007700">);<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">is_callable</font><font color="#007700">(</font><font color="#0000BB">$methodVariable</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">, </font><font color="#0000BB">$callable_name</font><font color="#007700">));&nbsp;&nbsp;</font><font color="#FF8000">//&nbsp;&nbsp;bool(true)<br /><br /></font><font color="#007700">echo </font><font color="#0000BB">$callable_name</font><font color="#007700">, </font><font color="#DD0000">"\n"</font><font color="#007700">;&nbsp;&nbsp;</font><font color="#FF8000">//&nbsp;&nbsp;someClass:someMethod<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
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>&#13;     See also <A
HREF="function.function-exists.html"
><B
CLASS="function"
>function_exists()</B
></A
> and 
     <A
HREF="function.method-exists.html"
><B
CLASS="function"
>method_exists()</B
></A
>.
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