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>filter_var</H1
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><P
>    (no version information, might be only in CVS)</P
>filter_var&nbsp;--&nbsp;Filters a variable with a specified filter</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN55949"
></A
><H2
>说明</H2
>mixed <B
CLASS="methodname"
>filter_var</B
> ( mixed variable [, int filter [, mixed options]] )<BR
></BR
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN55963"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>variable</CODE
></DT
><DD
><P
>&#13;       Value to filter, arrays are filtered recursively.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>filter</CODE
></DT
><DD
><P
>&#13;       ID of a filter to use.
       Defaults to <TT
CLASS="constant"
><B
>FILTER_SANITIZE_STRING</B
></TT
>.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>options</CODE
></DT
><DD
><P
>&#13;       Associative array of options or bitwise disjunction of flags. If filter
       accepts options, flags can be provided in "flags" field of array. For
       the "callback" filter, <A
HREF="language.pseudo-types.html#language.types.callback"
><B
CLASS="type"
>callback</B
></A
> type should be passed.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN55984"
></A
><H2
>返回值</H2
><P
>&#13;   Returns the filtered data, or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if the filter fails.
  </P
></DIV
><DIV
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><A
NAME="AEN55988"
></A
><H2
>范例</H2
><P
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><P
><B
>例 1. A <B
CLASS="function"
>filter_var()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />var_dump</font><font color="#007700">(</font><font color="#0000BB">filter_var</font><font color="#007700">(</font><font color="#DD0000">'bob@example.com'</font><font color="#007700">, </font><font color="#0000BB">FILTER_VALIDATE_EMAIL</font><font color="#007700">));<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">filter_var</font><font color="#007700">(</font><font color="#DD0000">'example.com'</font><font color="#007700">, </font><font color="#0000BB">FILTER_VALIDATE_URL</font><font color="#007700">, </font><font color="#0000BB">FILTER_FLAG_SCHEME_REQUIRED</font><font color="#007700">));<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
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><PRE
CLASS="screen"
>string(15) "bob@example.com"
bool(false)</PRE
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN55997"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><TBODY
><TR
><TD
><A
HREF="function.filter-var-array.html"
><B
CLASS="function"
>filter_var_array()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.filter-input.html"
><B
CLASS="function"
>filter_input()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.filter-input-array.html"
><B
CLASS="function"
>filter_input_array()</B
></A
></TD
></TR
><TR
><TD
>有关 <A
HREF="language.pseudo-types.html#language.types.callback"
>callback</A
> 类型的信息</TD
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></P
>
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