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php-manual-en-4.3.0-2mdk.noarch.rpm

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>version_compare</H1
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><P
>    (PHP 4 &#62;= 4.1.0)</P
>version_compare&nbsp;--&nbsp;
     Compares two "PHP-standardized" version number strings
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><H2
>Description</H2
>int <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;     <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
><P
>&#13;     If you specify the third optional <TT
CLASS="parameter"
><I
>operator</I
></TT
>
     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 1 if the relationship is the one specified
     by the operator, 0 otherwise.
    </P
><P
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><B
>Example 1. <B
CLASS="function"
>version_compare()</B
> Example</B
></P
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><PRE
CLASS="php"
>// prints -1
echo version_compare("4.0.4", "4.0.6");

// these all print 1
echo version_compare("4.0.4", "4.0.6", "&#60;");
echo version_compare("4.0.6", "4.0.6", "eq");</PRE
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