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

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><H1
><A
NAME="function.version-compare"
></A
>version_compare</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN182541"
></A
><P
>    (PHP 4 &#62;= 4.1.0, PHP 5)</P
>version_compare&nbsp;--&nbsp;Compares two "PHP-standardized" version number strings</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN182544"
></A
><H2
>说明</H2
>mixed <B
CLASS="methodname"
>version_compare</B
> ( string version1, string version2 [, string operator] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>version_compare()</B
> compares two "PHP-standardized"
   version number strings. This is useful if you would like to write programs
   working only on some versions of PHP.
  </P
><P
>&#13;   The function first replaces <TT
CLASS="literal"
>_</TT
>, <TT
CLASS="literal"
>-</TT
> and
   <TT
CLASS="literal"
>+</TT
> with a dot <TT
CLASS="literal"
>.</TT
> in the version
   strings and also inserts dots <TT
CLASS="literal"
>.</TT
> before and after any
   non number so that for example '4.3.2RC1' becomes '4.3.2.RC.1'. Then it
   splits the results like if you were using explode('.', $ver). Then it
   compares the parts starting from left to right. If a part contains
   special version strings these are handled in the following order:
   <TT
CLASS="literal"
>dev</TT
> &#60; <TT
CLASS="literal"
>alpha</TT
> =
   <TT
CLASS="literal"
>a</TT
> &#60; <TT
CLASS="literal"
>beta</TT
> =
   <TT
CLASS="literal"
>b</TT
> &#60; <TT
CLASS="literal"
>RC</TT
> &#60;
   <TT
CLASS="literal"
>pl</TT
>. This way not only versions with different levels
   like '4.1' and '4.1.2' can be compared but also any PHP specific version
   containing development state.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN182573"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>version1</CODE
></DT
><DD
><P
>&#13;       First version number.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>version2</CODE
></DT
><DD
><P
>&#13;       Second version number.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>operator</CODE
></DT
><DD
><P
>&#13;       If you specify the third optional <CODE
CLASS="parameter"
>operator</CODE
>
       argument, you can test for a particular relationship. The
       possible operators are: <TT
CLASS="literal"
>&#60;</TT
>,
       <TT
CLASS="literal"
>lt</TT
>, <TT
CLASS="literal"
>&#60;=</TT
>,
       <TT
CLASS="literal"
>le</TT
>, <TT
CLASS="literal"
>&#62;</TT
>,
       <TT
CLASS="literal"
>gt</TT
>, <TT
CLASS="literal"
>&#62;=</TT
>,
       <TT
CLASS="literal"
>ge</TT
>, <TT
CLASS="literal"
>==</TT
>,
       <TT
CLASS="literal"
>=</TT
>, <TT
CLASS="literal"
>eq</TT
>,
       <TT
CLASS="literal"
>!=</TT
>, <TT
CLASS="literal"
>&#60;&#62;</TT
>,
       <TT
CLASS="literal"
>ne</TT
> respectively. Using this argument, the
       function will return <TT
CLASS="constant"
><B
>TRUE</B
></TT
> if the relationship is the one specified
       by the operator, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> otherwise.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN182609"
></A
><H2
>返回值</H2
><P
>&#13;   <B
CLASS="function"
>version_compare()</B
> returns -1 if the first
   version is lower than the second, 0 if they are equal, and +1 if
   the second is lower.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN182613"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN182616"
></A
><P
><B
>例 1. <B
CLASS="function"
>version_compare()</B
> example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">// prints -1<br /></font><font color="#007700">echo </font><font color="#0000BB">version_compare</font><font color="#007700">(</font><font color="#DD0000">"4.0.4"</font><font color="#007700">, </font><font color="#DD0000">"4.0.6"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// these all print 1<br /></font><font color="#007700">echo </font><font color="#0000BB">version_compare</font><font color="#007700">(</font><font color="#DD0000">"4.0.4"</font><font color="#007700">, </font><font color="#DD0000">"4.0.6"</font><font color="#007700">, </font><font color="#DD0000">"&lt;"</font><font color="#007700">);<br />echo </font><font color="#0000BB">version_compare</font><font color="#007700">(</font><font color="#DD0000">"4.0.6"</font><font color="#007700">, </font><font color="#DD0000">"4.0.6"</font><font color="#007700">, </font><font color="#DD0000">"eq"</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN182620"
></A
><H2
>注释</H2
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    The <TT
CLASS="constant"
><B
>PHP_VERSION</B
></TT
> constant holds current PHP version.
   </P
></BLOCKQUOTE
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