blocks|key|740610|text|默认情况下，mysql_fetch_array()返回组合的关联和索引数组结构。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|740611|SELECT+a,b,c+FROM+table|code-block|syntax|javascript|740612|将生成一个行数组，|740613|$row+=+array(0+=>+'value+of+a',+'a'+=>+'value+of+a',+1+=>+'value+of+b',+etc...);|740614|您可以通过指定可选的fetch_mode参数来强制它执行其中一个操作：|740615|$row+=+mysql_fetch_array($result,+MYSQL_BOTH);+//+default+mode
$row+=+mysql_fetch_array($result,+MYSQL_ASSOC);+//+same+as+mysql_fetch_assoc:+associative+array
$row+=+mysql_fetch_array($result,+MYSQL_NUM);+//+same+as+mysql_fetch_row:+indexed+array|740616|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

mysql_fetch_array() by default returns a combined associative AND indexed array structure.

<pre><code>SELECT a,b,c FROM table
</code></pre>

will produce a row array of

<pre><code>$row = array(0 =&gt; 'value of a', 'a' =&gt; 'value of a', 1 =&gt; 'value of b', etc...);
</code></pre>

You can force it to do one or the other by specifying the optional fetch_mode parameter:

<pre><code>$row = mysql_fetch_array($result, MYSQL_BOTH); // default mode
$row = mysql_fetch_array($result, MYSQL_ASSOC); // same as mysql_fetch_assoc: associative array
$row = mysql_fetch_array($result, MYSQL_NUM); // same as mysql_fetch_row: indexed array
</code></pre>

blocks|key|4921453|text|如果您查看mysql_fetch_array的文档，您将看到第二个参数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4921454|$result_type+=+MYSQL_BOTH|code-block|syntax|javascript|4921455|这意味着，函数也会返回带有关联键和数值键的合并数组。|4921456|所以你有两倍的数据。|4921457|您可以使用以下命令来避免它：|4921458|$row+=+mysql_fetch_array($result,+MYSQL_ASSOC);|4921459|或者只是：|4921460|$row+=+mysql_fetch_assoc($result);|4921461|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.mysql-fetch-array.php^0|5|H|5|H|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1B|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1C|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1D|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1E|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1F|8|@]|D|@]|E|$]]|$1|U|3|V|5|H|7|1G|8|@]|D|@]|E|$I|J]]|$1|W|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]]]

If you look into documentation of <a href="http://php.net/manual/en/function.mysql-fetch-array.php" rel="nofollow"><code>mysql_fetch_array</code></a>, you will see a second parameter:

<pre><code>$result_type = MYSQL_BOTH
</code></pre>

It means that, function returns merged arrays with associative keys and numeric keys too.

So you have doubled data.

You can avoid it with:

<pre><code>$row = mysql_fetch_array($result, MYSQL_ASSOC);
</code></pre>

or just:

<pre><code>$row = mysql_fetch_assoc($result);
</code></pre>

blocks|key|4638377|text|神奇的链接：http://php.net/mysql_fetch_array|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4638378|顺便说一句，您的桌子设置似乎不太合理。|4638379|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/mysql_fetch_array^0|6|W|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

a magic link: <a href="http://php.net/mysql_fetch_array" rel="nofollow">http://php.net/mysql_fetch_array</a>

your table setup doesn't seem quite sensible, by the way.

blocks|key|3023017|text|mysql_fetch_array每列返回2列。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3023018|例如：|3023019|array(
++++[0]+=>+'1.jpg',
++++['one']+=>+'1.jpg'
++++etc..|code-block|syntax|javascript|3023020|如果你使用mysql_query($query,MYSQL_ASSOC)，你只能得到['one']。|offset|length|style|CODE|3023021|请查看此文档：http://nl3.php.net/manual/en/function.mysql-fetch-array.php|3023022|entityMap|0|LINK|mutability|MUTABLE|url|http://nl3.php.net/manual/en/function.mysql-fetch-array.php^0|0|0|0|5|V|16|7|0|7|1N|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@$K|12|L|13|M|N]|$K|14|L|15|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@$K|17|L|18|1|19]]|A|$]]|$1|Q|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

mysql_fetch_array returns 2 colums per column.

For example:

<pre><code>array(
 [0] =&gt; '1.jpg',
 ['one'] =&gt; '1.jpg'
 etc..
</code></pre>

if you do <code>mysql_query($query,MYSQL_ASSOC)</code> you will get the <code>['one']</code> only.

Check this documentation: <a href="http://nl3.php.net/manual/en/function.mysql-fetch-array.php" rel="nofollow">http://nl3.php.net/manual/en/function.mysql-fetch-array.php</a>

blocks|key|4638429|text|如果你使用mysql_fetch_assoc()，你将只有$row['one']，不再有$row[1]。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4638430|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/mysql_fetch_assoc^0|5|J|T|B|18|7|5|J|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

If you use <a href="http://php.net/mysql_fetch_assoc" rel="nofollow"><code>mysql_fetch_assoc()</code></a>, you'll only have <code>$row['one']</code> and no more <code>$row[1]</code>.

This is my php script

<pre><code>$result = mysql_query("SELECT * FROM photos WHERE perID=2");
$row = mysql_fetch_array($result);
$a = count($row); // or sizeof($row)
echo $a; //outputs 22 but i expect it to be 11 but why does it output 22 ?
</code></pre>

This is the data in mysql. 

<pre><code>perID one two three four five six sev eit nine ten
 2 1.jpg 2.jpg 3.jpg 4.jpg 5.jpg 6.jpg 7.jpg 8.jpg 9.jpg 10.jpg
</code></pre>

I expect it to be 11 but surprisingly its 22. Could anyone explain me why? Does it also include the 'one' 'two' (the column names) stuff too in the count function ? because it would be 22, if only if it includes them.

But it should not include the column part of table as they are headers right? please help me with these Any help is greatly appreciated

also please give me a link or the way to achieve 11 as result

why does count return 22 instead of 11?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这是我的php脚本$result = mysql_query("SELECT * FROM photos WHERE perID=2");$row = mysql_fetch_array($result);$a = count($row);                     // or sizeof($row)e...

问为什么count返回22而不是11？
EN

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问为什么count返回22而不是11？EN