function.empty.html | searchcode

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CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>Руководство по PHP</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="function.doubleval.html"
ACCESSKEY="P"
>Пред.</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
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ALIGN="right"
VALIGN="bottom"
><A
HREF="function.floatval.html"
ACCESSKEY="N"
>След.</A
></TD
></TR
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.empty"
></A
>empty</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN189689"
></A
><P
>    (PHP 3, PHP 4, PHP 5)</P
>empty&nbsp;--&nbsp;Determine whether a variable is empty</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189692"
></A
><H2
>Описание</H2
>bool <B
CLASS="methodname"
>empty</B
> ( mixed var )<BR
></BR
><P
>&#13;   Determine whether a variable is considered to be empty.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189701"
></A
><H2
>Список параметров</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><VAR
CLASS="parameter"
>var</VAR
></DT
><DD
><P
>&#13;       Variable to be checked
      </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Замечание: </B
>
        <B
CLASS="function"
>empty()</B
> only checks variables as anything else will
        result in a parse error. In other words, the following will not work:
        <B
CLASS="command"
>empty(trim($name))</B
>.
       </P
></BLOCKQUOTE
></DIV
><P
>&#13;       <B
CLASS="function"
>empty()</B
> is the opposite of
       <VAR
CLASS="literal"
>(boolean) <VAR
CLASS="parameter"
>var</VAR
></VAR
>,
       except that no warning is generated when the variable is not set.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189718"
></A
><H2
>Возвращаемые значения</H2
><P
>&#13;   Returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if <VAR
CLASS="parameter"
>var</VAR
> has a non-empty
   and non-zero value.
  </P
><P
>&#13;   The following things are considered to be empty:
   <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><VAR
CLASS="literal"
>"" (an empty string)</VAR
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>0 (0 as an integer)</VAR
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"0" (0 as a string)</VAR
></TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>NULL</B
></TT
></TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>array() (an empty array)</VAR
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>var $var; (a variable declared, but without a value in a class)</VAR
></TD
></TR
></TBODY
></TABLE
><P
></P
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189739"
></A
><H2
>Список изменений</H2
><P
>&#13;   <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN189742"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Версия</TH
><TH
>Описание</TH
></TR
></THEAD
><TBODY
><TR
><TD
>PHP 5</TD
><TD
>&#13;        <P
>&#13;         As of PHP 5, objects with no properties are no longer considered empty.
        </P
>
       </TD
></TR
><TR
><TD
>PHP 4</TD
><TD
>&#13;        <P
>&#13;         As of PHP 4, The string value "0" is considered empty.
        </P
>
       </TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189757"
></A
><H2
>Примеры</H2
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN189760"
></A
><P
><B
>Пример 1. 
     A simple <B
CLASS="function"
>empty()</B
> / <A
HREF="function.isset.html"
><B
CLASS="function"
>isset()</B
></A
>
     comparison.
    </B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$var </font><font color="#007700">= </font><font color="#0000BB">0</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// Evaluates to true because $var is empty<br /></font><font color="#007700">if (empty(</font><font color="#0000BB">$var</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">'$var is either 0, empty, or not set at all'</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">// Evaluates as true because $var is set<br /></font><font color="#007700">if (isset(</font><font color="#0000BB">$var</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">'$var is set even though it is empty'</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189765"
></A
><H2
>Примечания</H2
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Замечание: </B
>Поскольку это языковая
конструкция, а не функция, она не может вызываться при помощи
<A
HREF="functions.variable-functions.html"
>переменных функций</A
></P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN189770"
></A
><H2
>Смотрите также</H2
><P
>&#13;   <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.isset.html"
><B
CLASS="function"
>isset()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.unset.html"
><B
CLASS="function"
>unset()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.array-key-exists.html"
><B
CLASS="function"
>array_key_exists()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.count.html"
><B
CLASS="function"
>count()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.strlen.html"
><B
CLASS="function"
>strlen()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="types.comparisons.html"
>The type comparison tables</A
></TD
></TR
></TBODY
></TABLE
><P
></P
>
  </P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
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><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="function.doubleval.html"
ACCESSKEY="P"
>Пред.</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Начало</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.floatval.html"
ACCESSKEY="N"
>След.</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>doubleval</TD
><TD
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