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><H1
><A
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></A
>in_array</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN13039"
></A
><P
>    (PHP 4, PHP 5)</P
>in_array&nbsp;--&nbsp;检查数组中是否存在某个值</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN13042"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>in_array</B
> ( mixed needle, array haystack [, bool strict] )<BR
></BR
><P
>&#13;     在 <CODE
CLASS="parameter"
>haystack</CODE
> 中搜索
     <CODE
CLASS="parameter"
>needle</CODE
>,如果找到则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>,否则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
    </P
><P
>&#13;     如果第三个参数 <CODE
CLASS="parameter"
>strict</CODE
> 的值为
     <TT
CLASS="constant"
><B
>TRUE</B
></TT
> 则 <B
CLASS="function"
>in_array()</B
> 函数还会检查
     <CODE
CLASS="parameter"
>needle</CODE
> 的<A
HREF="language.types.html"
>类型</A
>是否和
     <CODE
CLASS="parameter"
>haystack</CODE
> 中的相同。
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      如果 <CODE
CLASS="parameter"
>needle</CODE
> 是字符串,则比较是区分大小写的。
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      在 PHP 版本 4.2.0 之前,<CODE
CLASS="parameter"
>needle</CODE
> 不允许是一个数组。
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN13075"
></A
><P
><B
>例 1. <B
CLASS="function"
>in_array()</B
> 例子</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$os </font><font color="#007700">= array(</font><font color="#DD0000">"Mac"</font><font color="#007700">, </font><font color="#DD0000">"NT"</font><font color="#007700">, </font><font color="#DD0000">"Irix"</font><font color="#007700">, </font><font color="#DD0000">"Linux"</font><font color="#007700">);<br />if (</font><font color="#0000BB">in_array</font><font color="#007700">(</font><font color="#DD0000">"Irix"</font><font color="#007700">, </font><font color="#0000BB">$os</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Got Irix"</font><font color="#007700">;<br />}<br />if (</font><font color="#0000BB">in_array</font><font color="#007700">(</font><font color="#DD0000">"mac"</font><font color="#007700">, </font><font color="#0000BB">$os</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Got mac"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>&#13;       第二个条件失败,因为 <B
CLASS="function"
>in_array()</B
>
       是区分大小写的,所以以上程序显示为:
      </P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
Got Irix</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN13083"
></A
><P
><B
>例 2. <B
CLASS="function"
>in_array()</B
> 严格类型检查例子</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$a </font><font color="#007700">= array(</font><font color="#DD0000">'1.10'</font><font color="#007700">, </font><font color="#0000BB">12.4</font><font color="#007700">, </font><font color="#0000BB">1.13</font><font color="#007700">);<br /><br />if (</font><font color="#0000BB">in_array</font><font color="#007700">(</font><font color="#DD0000">'12.4'</font><font color="#007700">, </font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"'12.4' found with strict check\n"</font><font color="#007700">;<br />}<br />if (</font><font color="#0000BB">in_array</font><font color="#007700">(</font><font color="#0000BB">1.13</font><font color="#007700">, </font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"1.13 found with strict check\n"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
1.13 found with strict check</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN13090"
></A
><P
><B
>例 3. <B
CLASS="function"
>in_array()</B
> 中用数组作为 needle</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$a </font><font color="#007700">= array(array(</font><font color="#DD0000">'p'</font><font color="#007700">, </font><font color="#DD0000">'h'</font><font color="#007700">), array(</font><font color="#DD0000">'p'</font><font color="#007700">, </font><font color="#DD0000">'r'</font><font color="#007700">), </font><font color="#DD0000">'o'</font><font color="#007700">);<br /><br />if (</font><font color="#0000BB">in_array</font><font color="#007700">(array(</font><font color="#DD0000">'p'</font><font color="#007700">, </font><font color="#DD0000">'h'</font><font color="#007700">), </font><font color="#0000BB">$a</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"'ph' was found\n"</font><font color="#007700">;<br />}<br />if (</font><font color="#0000BB">in_array</font><font color="#007700">(array(</font><font color="#DD0000">'f'</font><font color="#007700">, </font><font color="#DD0000">'i'</font><font color="#007700">), </font><font color="#0000BB">$a</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"'fi' was found\n"</font><font color="#007700">;<br />}<br />if (</font><font color="#0000BB">in_array</font><font color="#007700">(</font><font color="#DD0000">'o'</font><font color="#007700">, </font><font color="#0000BB">$a</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"'o' was found\n"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>'ph' was found
  'o' was found</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     参见 <A
HREF="function.array-search.html"
><B
CLASS="function"
>array_search()</B
></A
>,<A
HREF="function.array-key-exists.html"
><B
CLASS="function"
>array_key_exists()</B
></A
>
     和 <A
HREF="function.isset.html"
><B
CLASS="function"
>isset()</B
></A
>。
    </P
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