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>array_intersect_key</H1
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NAME="AEN11100"
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><P
>    (PHP 5 &#62;= 5.1.0RC1)</P
>array_intersect_key&nbsp;--&nbsp;使用键名比较计算数组的交集</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN11103"
></A
><H2
>说明</H2
>array <B
CLASS="methodname"
>array_intersect_key</B
> ( array array1, array array2 [, array ...] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>array_intersect_key()</B
> 返回一个数组,该数组包含了所有出现在
   <CODE
CLASS="parameter"
>array1</CODE
> 中并同时出现在所有其它参数数组中的键名的值。
  </P
><P
>&#13;   <TABLE
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><B
>例 1. <B
CLASS="function"
>array_intersect_key()</B
> 例子</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$array1 </font><font color="#007700">= array(</font><font color="#DD0000">'blue'&nbsp;&nbsp;</font><font color="#007700">=&gt; </font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#DD0000">'red'&nbsp;&nbsp;</font><font color="#007700">=&gt; </font><font color="#0000BB">2</font><font color="#007700">, </font><font color="#DD0000">'green'&nbsp;&nbsp;</font><font color="#007700">=&gt; </font><font color="#0000BB">3</font><font color="#007700">, </font><font color="#DD0000">'purple' </font><font color="#007700">=&gt; </font><font color="#0000BB">4</font><font color="#007700">);<br /></font><font color="#0000BB">$array2 </font><font color="#007700">= array(</font><font color="#DD0000">'green' </font><font color="#007700">=&gt; </font><font color="#0000BB">5</font><font color="#007700">, </font><font color="#DD0000">'blue' </font><font color="#007700">=&gt; </font><font color="#0000BB">6</font><font color="#007700">, </font><font color="#DD0000">'yellow' </font><font color="#007700">=&gt; </font><font color="#0000BB">7</font><font color="#007700">, </font><font color="#DD0000">'cyan'&nbsp;&nbsp;&nbsp;</font><font color="#007700">=&gt; </font><font color="#0000BB">8</font><font color="#007700">);<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">array_intersect_key</font><font color="#007700">(</font><font color="#0000BB">$array1</font><font color="#007700">, </font><font color="#0000BB">$array2</font><font color="#007700">));<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
>上例将输出:</P
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><PRE
CLASS="screen"
>array(2) {
  ["blue"]=&#62;
  int(1)
  ["green"]=&#62;
  int(3)
})</PRE
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></TD
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>
  </P
><P
>&#13;   上例中可以看到只有 <TT
CLASS="literal"
>'blue'</TT
>
   和 <TT
CLASS="literal"
>'green'</TT
> 两个键名出现在两个数组中,因此被返回。此外注意
   <TT
CLASS="literal"
>'blue'</TT
> 和 <TT
CLASS="literal"
>'green'</TT
>
   的值在两个数组中是不同的。但因为只检查键名,因此还是匹配。返回的值只是
   <CODE
CLASS="parameter"
>array1</CODE
> 中的。
  </P
><P
>&#13;   在 <TT
CLASS="literal"
>key =&#62; value</TT
> 对中的两个键名仅在
   <TT
CLASS="literal"
>(string) $key1 === (string) $key2 </TT
>
   时被认为相等。换句话说,执行的是严格类型检查,因此字符串的表达必须完全一样。
  </P
><P
>&#13;   参见
   <A
HREF="function.array-diff.html"
><B
CLASS="function"
>array_diff()</B
></A
>,<A
HREF="function.array-udiff.html"
><B
CLASS="function"
>array_udiff()</B
></A
>,<A
HREF="function.array-diff-assoc.html"
><B
CLASS="function"
>array_diff_assoc()</B
></A
>,<A
HREF="function.array-diff-uassoc.html"
><B
CLASS="function"
>array_diff_uassoc()</B
></A
>,<A
HREF="function.array-udiff-assoc.html"
><B
CLASS="function"
>array_udiff_assoc()</B
></A
>,<A
HREF="function.array-udiff-uassoc.html"
><B
CLASS="function"
>array_udiff_uassoc()</B
></A
>,<A
HREF="function.array-diff-key.html"
><B
CLASS="function"
>array_diff_key()</B
></A
>,<A
HREF="function.array-diff-ukey.html"
><B
CLASS="function"
>array_diff_ukey()</B
></A
>,<A
HREF="function.array-intersect.html"
><B
CLASS="function"
>array_intersect()</B
></A
>,<A
HREF="function.array-intersect-assoc.html"
><B
CLASS="function"
>array_intersect_assoc()</B
></A
>,<A
HREF="function.array-intersect-uassoc.html"
><B
CLASS="function"
>array_intersect_uassoc()</B
></A
>
   和
   <A
HREF="function.array-intersect-ukey.html"
><B
CLASS="function"
>array_intersect_ukey()</B
></A
>。
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