Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

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>array_keys</H1
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><P
>    (PHP 4, PHP 5)</P
>array_keys&nbsp;--&nbsp;返回数组中所有的键名</DIV
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>说明</H2
>array <B
CLASS="methodname"
>array_keys</B
> ( array input [, mixed search_value [, bool strict]] )<BR
></BR
><P
>&#13;     <B
CLASS="function"
>array_keys()</B
> 返回 <CODE
CLASS="parameter"
>input</CODE
>
     数组中的数字或者字符串的键名。
    </P
><P
>&#13;     如果指定了可选参数 <CODE
CLASS="parameter"
>search_value</CODE
>，则只返回该值的键名。否则
     <CODE
CLASS="parameter"
>input</CODE
> 数组中的所有键名都会被返回。自
     PHP 5 起，可以用 <CODE
CLASS="parameter"
>strict</CODE
> 参数来进行全等比较（===）。
    </P
><P
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><B
>例 1. <B
CLASS="function"
>array_keys()</B
> 例子</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$array </font><font color="#007700">= array(</font><font color="#0000BB">0 </font><font color="#007700">=&gt; </font><font color="#0000BB">100</font><font color="#007700">, </font><font color="#DD0000">"color" </font><font color="#007700">=&gt; </font><font color="#DD0000">"red"</font><font color="#007700">);<br /></font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">array_keys</font><font color="#007700">(</font><font color="#0000BB">$array</font><font color="#007700">));<br /><br /></font><font color="#0000BB">$array </font><font color="#007700">= array(</font><font color="#DD0000">"blue"</font><font color="#007700">, </font><font color="#DD0000">"red"</font><font color="#007700">, </font><font color="#DD0000">"green"</font><font color="#007700">, </font><font color="#DD0000">"blue"</font><font color="#007700">, </font><font color="#DD0000">"blue"</font><font color="#007700">);<br /></font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">array_keys</font><font color="#007700">(</font><font color="#0000BB">$array</font><font color="#007700">, </font><font color="#DD0000">"blue"</font><font color="#007700">));<br /><br /></font><font color="#0000BB">$array </font><font color="#007700">= array(</font><font color="#DD0000">"color" </font><font color="#007700">=&gt; array(</font><font color="#DD0000">"blue"</font><font color="#007700">, </font><font color="#DD0000">"red"</font><font color="#007700">, </font><font color="#DD0000">"green"</font><font color="#007700">),<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#DD0000">"size"&nbsp;&nbsp;</font><font color="#007700">=&gt; array(</font><font color="#DD0000">"small"</font><font color="#007700">, </font><font color="#DD0000">"medium"</font><font color="#007700">, </font><font color="#DD0000">"large"</font><font color="#007700">));<br /></font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">array_keys</font><font color="#007700">(</font><font color="#0000BB">$array</font><font color="#007700">));<br /></font><font color="#0000BB">?&gt;</font>
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</code></TD
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>上例将输出：</P
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>Array
(
    [0] =&#62; 0
    [1] =&#62; color
)
Array
(
    [0] =&#62; 0
    [1] =&#62; 3
    [2] =&#62; 4
)
Array
(
    [0] =&#62; color
    [1] =&#62; size
)</PRE
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>
    </P
><P
>&#13;     参见 <A
HREF="function.array-values.html"
><B
CLASS="function"
>array_values()</B
></A
> 和 <A
HREF="function.array-key-exists.html"
><B
CLASS="function"
>array_key_exists()</B
></A
>。
    </P
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