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>mysqli_fetch_lengths</H1
><DIV
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><A
NAME="AEN138950"
></A
><P
> (PHP 5)</P
>mysqli_fetch_lengths<P
> (no version information, might be only in CVS)</P
>result->lengths() -- Returns the lengths of the columns of the current row in the result set</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138954"
></A
><H2
>说明</H2
><P
>Procedural style:</P
>array <B
CLASS="methodname"
>mysqli_fetch_lengths</B
> ( mysqli_result result )<BR
></BR
><P
>Object oriented style (property):</P
>class <B
CLASS="classname"
>mysqli_result</B
> { <BR
></BR
>array lengths<BR
></BR
>}<P
> The <B
CLASS="function"
>mysqli_fetch_lengths()</B
> function returns an array
containing the lengths of every column of the current row within the result
set.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138972"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
> result</CODE
></DT
><DD
><P
>Procedural style only: A result set
identifier returned by <A
HREF="function.mysqli-query.html"
><B
CLASS="function"
>mysqli_query()</B
></A
>, <A
HREF="function.mysqli-store-result.html"
><B
CLASS="function"
>mysqli_store_result()</B
></A
>
or <A
HREF="function.mysqli-use-result.html"
><B
CLASS="function"
>mysqli_use_result()</B
></A
>.</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138984"
></A
><H2
>返回值</H2
><P
> An array of integers representing the size of each column (not including
any terminating null characters). <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if an error occurred.
</P
><P
> <B
CLASS="function"
>mysqli_fetch_lengths()</B
> is valid only for the current
row of the result set. It returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if you call it before calling
mysqli_fetch_row/array/object or after retrieving all rows in the result.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138991"
></A
><H2
>范例</H2
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><P
><B
>例 1. Object oriented style</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$mysqli </font><font color="#007700">= new </font><font color="#0000BB">mysqli</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT * from Country ORDER BY Code LIMIT 1"</font><font color="#007700">;<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#0000BB">$query</font><font color="#007700">)) {<br /><br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">fetch_row</font><font color="#007700">();<br /><br /> </font><font color="#FF8000">/* display column lengths */<br /> </font><font color="#007700">foreach (</font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">lengths </font><font color="#007700">as </font><font color="#0000BB">$i </font><font color="#007700">=> </font><font color="#0000BB">$val</font><font color="#007700">) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Field %2d has Length %2d\n"</font><font color="#007700">, </font><font color="#0000BB">$i</font><font color="#007700">+</font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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><P
><B
>例 2. Procedural style</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">mysqli_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT * from Country ORDER BY Code LIMIT 1"</font><font color="#007700">;<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#0000BB">$query</font><font color="#007700">)) {<br /><br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">mysqli_fetch_row</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /><br /> </font><font color="#FF8000">/* display column lengths */<br /> </font><font color="#007700">foreach (</font><font color="#0000BB">mysqli_fetch_lengths</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">) as </font><font color="#0000BB">$i </font><font color="#007700">=> </font><font color="#0000BB">$val</font><font color="#007700">) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Field %2d has Length %2d\n"</font><font color="#007700">, </font><font color="#0000BB">$i</font><font color="#007700">+</font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">mysqli_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">mysqli_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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><P
>上例将输出：</P
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><PRE
CLASS="screen"
>Field 1 has Length 3
Field 2 has Length 5
Field 3 has Length 13
Field 4 has Length 9
Field 5 has Length 6
Field 6 has Length 1
Field 7 has Length 6
Field 8 has Length 4
Field 9 has Length 6
Field 10 has Length 6
Field 11 has Length 5
Field 12 has Length 44
Field 13 has Length 7
Field 14 has Length 3
Field 15 has Length 2</PRE
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