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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>章 15. 运算符</TD
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>数组运算符</A
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><A
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><P
><B
>表 15-8. 数组运算符</B
></P
><TABLE
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><COL><COL><COL><THEAD
><TR
><TH
>例子</TH
><TH
>名称</TH
><TH
>结果</TH
></TR
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><TR
><TD
>$a + $b</TD
><TD
>联合</TD
><TD
>$a 和 $b 的联合。</TD
></TR
><TR
><TD
>$a == $b</TD
><TD
>相等</TD
><TD
>如果 $a 和 $b 具有相同的键／值对则为 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>。</TD
></TR
><TR
><TD
>$a === $b</TD
><TD
>全等</TD
><TD
>如果 $a 和 $b 具有相同的键／值对并且顺序和类型都相同则为 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>。</TD
></TR
><TR
><TD
>$a != $b</TD
><TD
>不等</TD
><TD
>如果 $a 不等于 $b 则为 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>。</TD
></TR
><TR
><TD
>$a &#60;&#62; $b</TD
><TD
>不等</TD
><TD
>如果 $a 不等于 $b 则为 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>。</TD
></TR
><TR
><TD
>$a !== $b</TD
><TD
>不全等</TD
><TD
>如果 $a 不全等于 $b 则为 <TT
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><B
>TRUE</B
></TT
>。</TD
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>&#13;    <TT
CLASS="literal"
>+</TT
> 运算符把右边的数组附加到左边的数组后面，但是重复的键值不会被覆盖。
   </P
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>&#13;    <DIV
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$a </font><font color="#007700">= array(</font><font color="#DD0000">"a" </font><font color="#007700">=&gt; </font><font color="#DD0000">"apple"</font><font color="#007700">, </font><font color="#DD0000">"b" </font><font color="#007700">=&gt; </font><font color="#DD0000">"banana"</font><font color="#007700">);<br /></font><font color="#0000BB">$b </font><font color="#007700">= array(</font><font color="#DD0000">"a" </font><font color="#007700">=&gt; </font><font color="#DD0000">"pear"</font><font color="#007700">, </font><font color="#DD0000">"b" </font><font color="#007700">=&gt; </font><font color="#DD0000">"strawberry"</font><font color="#007700">, </font><font color="#DD0000">"c" </font><font color="#007700">=&gt; </font><font color="#DD0000">"cherry"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$c </font><font color="#007700">= </font><font color="#0000BB">$a </font><font color="#007700">+ </font><font color="#0000BB">$b</font><font color="#007700">; </font><font color="#FF8000">// Union of $a and $b<br /></font><font color="#007700">echo </font><font color="#DD0000">"Union of \$a and \$b: \n"</font><font color="#007700">;<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$c</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$c </font><font color="#007700">= </font><font color="#0000BB">$b </font><font color="#007700">+ </font><font color="#0000BB">$a</font><font color="#007700">; </font><font color="#FF8000">// Union of $b and $a<br /></font><font color="#007700">echo </font><font color="#DD0000">"Union of \$b and \$a: \n"</font><font color="#007700">;<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$c</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
    执行后，此脚本会显示：
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><code><font color="#000000">
Union of $a and $b:<br />array(3) {<br />&nbsp;&nbsp;["a"]=&gt;<br />&nbsp;&nbsp;string(5) "apple"<br />&nbsp;&nbsp;["b"]=&gt;<br />&nbsp;&nbsp;string(6) "banana"<br />&nbsp;&nbsp;["c"]=&gt;<br />&nbsp;&nbsp;string(6) "cherry"<br />}<br />Union of $b and $a:<br />array(3) {<br />&nbsp;&nbsp;["a"]=&gt;<br />&nbsp;&nbsp;string(4) "pear"<br />&nbsp;&nbsp;["b"]=&gt;<br />&nbsp;&nbsp;string(10) "strawberry"<br />&nbsp;&nbsp;["c"]=&gt;<br />&nbsp;&nbsp;string(6) "cherry"<br />}</font>
</code></TD
></TR
></TABLE
>
   </P
><P
>&#13;    数组中的单元如果具有相同的键名和值则比较时相等。
   </P
><P
>&#13;    <TABLE
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><P
><B
>例 15-5. 比较数组</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$a </font><font color="#007700">= array(</font><font color="#DD0000">"apple"</font><font color="#007700">, </font><font color="#DD0000">"banana"</font><font color="#007700">);<br /></font><font color="#0000BB">$b </font><font color="#007700">= array(</font><font color="#0000BB">1 </font><font color="#007700">=&gt; </font><font color="#DD0000">"banana"</font><font color="#007700">, </font><font color="#DD0000">"0" </font><font color="#007700">=&gt; </font><font color="#DD0000">"apple"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$a </font><font color="#007700">== </font><font color="#0000BB">$b</font><font color="#007700">); </font><font color="#FF8000">// bool(true)<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$a </font><font color="#007700">=== </font><font color="#0000BB">$b</font><font color="#007700">); </font><font color="#FF8000">// bool(false)<br /></font><font color="#0000BB">?&gt;</font>
</font>
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>
   </P
><P
>&#13;    参见<A
HREF="language.types.array.html"
>数组类型</A
>和<A
HREF="ref.array.html"
>数组函数</A
>章节。
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