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>mysql_fetch_assoc</H1
><DIV
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></A
><P
> (PHP 4 >= 4.0.3, PHP 5)</P
>mysql_fetch_assoc --
从结果集中取得一行作为关联数组
</DIV
><DIV
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><A
NAME="AEN135493"
></A
><H2
>说明</H2
>array <B
CLASS="methodname"
>mysql_fetch_assoc</B
> ( resource result )<BR
></BR
><P
> 返回根据从结果集取得的行生成的关联数组，如果没有更多行则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
</P
><P
> <B
CLASS="function"
>mysql_fetch_assoc()</B
> 和用
<A
HREF="function.mysql-fetch-array.html"
><B
CLASS="function"
>mysql_fetch_array()</B
></A
> 加上第二个可选参数
MYSQL_ASSOC 完全相同。它仅仅返回关联数组。这也是
<A
HREF="function.mysql-fetch-array.html"
><B
CLASS="function"
>mysql_fetch_array()</B
></A
>
起初始的工作方式。如果在关联索引之外还需要数字索引，用
<A
HREF="function.mysql-fetch-array.html"
><B
CLASS="function"
>mysql_fetch_array()</B
></A
>。
</P
><P
> 如果结果中的两个或以上的列具有相同字段名，最后一列将优先。要访问同名的其它列，要么用
<A
HREF="function.mysql-fetch-row.html"
><B
CLASS="function"
>mysql_fetch_row()</B
></A
>
来取得数字索引或给该列起个别名。参见
<A
HREF="function.mysql-fetch-array.html"
><B
CLASS="function"
>mysql_fetch_array()</B
></A
> 例子中有关别名说明。
</P
><P
> 有一点很重要必须指出，用
<B
CLASS="function"
>mysql_fetch_assoc()</B
>
并<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>不明显</I
></SPAN
> 比用
<A
HREF="function.mysql-fetch-row.html"
><B
CLASS="function"
>mysql_fetch_row()</B
></A
>
慢，而且还提供了明显更多的值。
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>本函数返回的字段名是<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>区分大小写</I
></SPAN
>的。</P
></BLOCKQUOTE
></DIV
><P
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><A
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></A
><P
><B
>例 1. 扩展的 <B
CLASS="function"
>mysql_fetch_assoc()</B
> 例子</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br /><br /> $conn </font><font color="#007700">= </font><font color="#0000BB">mysql_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"mysql_user"</font><font color="#007700">, </font><font color="#DD0000">"mysql_password"</font><font color="#007700">);<br /><br /> if (!</font><font color="#0000BB">$conn</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"Unable to connect to DB: " </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">();<br /> exit;<br /> }<br /><br /> if (!</font><font color="#0000BB">mysql_select_db</font><font color="#007700">(</font><font color="#DD0000">"mydbname"</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"Unable to select mydbname: " </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">();<br /> exit;<br /> }<br /><br /> </font><font color="#0000BB">$sql </font><font color="#007700">= </font><font color="#DD0000">"SELECT id as userid, fullname, userstatus<br /> FROM sometable<br /> WHERE userstatus = 1"</font><font color="#007700">;<br /><br /> </font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysql_query</font><font color="#007700">(</font><font color="#0000BB">$sql</font><font color="#007700">);<br /><br /> if (!</font><font color="#0000BB">$result</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"Could not successfully run query ($sql) from DB: " </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">();<br /> exit;<br /> }<br /><br /> if (</font><font color="#0000BB">mysql_num_rows</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">) == </font><font color="#0000BB">0</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"No rows found, nothing to print so am exiting"</font><font color="#007700">;<br /> exit;<br /> }<br /><br /> </font><font color="#FF8000">// While a row of data exists, put that row in $row as an associative array<br /> // Note: If you're expecting just one row, no need to use a loop<br /> // Note: If you put extract($row); inside the following loop, you'll<br /> // then create $userid, $fullname, and $userstatus<br /> </font><font color="#007700">while (</font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">mysql_fetch_assoc</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">)) {<br /> echo </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">"userid"</font><font color="#007700">];<br /> echo </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">"fullname"</font><font color="#007700">];<br /> echo </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">"userstatus"</font><font color="#007700">];<br /> }<br /><br /> </font><font color="#0000BB">mysql_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?></font>
</font>
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><P
> 参见
<A
HREF="function.mysql-fetch-row.html"
><B
CLASS="function"
>mysql_fetch_row()</B
></A
>，<A
HREF="function.mysql-fetch-array.html"
><B
CLASS="function"
>mysql_fetch_array()</B
></A
>，<A
HREF="function.mysql-query.html"
><B
CLASS="function"
>mysql_query()</B
></A
> 和
<A
HREF="function.mysql-error.html"
><B
CLASS="function"
>mysql_error()</B
></A
>。
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