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>strnatcmp</H1
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><P
>    (PHP 4 )</P
>strnatcmp&nbsp;--&nbsp;
     String comparisons using a "natural order" algorithm
    </DIV
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><H2
>Description</H2
>int <B
CLASS="methodname"
>strnatcmp</B
> ( string str1, string str2)<BR
></BR
><P
>&#13;     This function implements a comparison algorithm that orders
     alphanumeric strings in the way a human being would, this is
     described as a "natural ordering".  An example of the difference
     between this algorithm and the regular computer string sorting
     algorithms (used in <A
HREF="function.strcmp.html"
><B
CLASS="function"
>strcmp()</B
></A
>) can be seen
     below:
     <DIV
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NAME="AEN91271"
></A
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><PRE
CLASS="php"
>$arr1 = $arr2 = array("img12.png","img10.png","img2.png","img1.png");
echo "Standard string comparison\n";
usort($arr1,"strcmp");
print_r($arr1);
echo "\nNatural order string comparison\n";
usort($arr2,"strnatcmp");
print_r($arr2);</PRE
></TD
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>
     The code above will generate the following output:
     <DIV
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>Standard string comparison
Array
(
    [0] =&#62; img1.png
    [1] =&#62; img10.png
    [2] =&#62; img12.png
    [3] =&#62; img2.png
)

Natural order string comparison
Array
(
    [0] =&#62; img1.png
    [1] =&#62; img2.png
    [2] =&#62; img10.png
    [3] =&#62; img12.png
)</PRE
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><P
></P
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>
     For more information see: Martin Pool's <A
HREF="http://naturalordersort.org/"
TARGET="_top"
>Natural Order String Comparison</A
>
     page.
    </P
><P
>&#13;     Similar to other string comparison functions, this one returns
     &#60; 0 if <TT
CLASS="parameter"
><I
>str1</I
></TT
> is less than
     <TT
CLASS="parameter"
><I
>str2</I
></TT
>; &#62; 0 if
     <TT
CLASS="parameter"
><I
>str1</I
></TT
> is greater than
     <TT
CLASS="parameter"
><I
>str2</I
></TT
>, and 0 if they are equal.
    </P
><P
>&#13;     Note that this comparison is case sensitive.
    </P
><P
>&#13;     See also <A
HREF="function.ereg.html"
><B
CLASS="function"
>ereg()</B
></A
>,
     <A
HREF="function.strcasecmp.html"
><B
CLASS="function"
>strcasecmp()</B
></A
>, <A
HREF="function.substr.html"
><B
CLASS="function"
>substr()</B
></A
>,
     <A
HREF="function.stristr.html"
><B
CLASS="function"
>stristr()</B
></A
>, <A
HREF="function.strcmp.html"
><B
CLASS="function"
>strcmp()</B
></A
>,
     <A
HREF="function.strncmp.html"
><B
CLASS="function"
>strncmp()</B
></A
>, <A
HREF="function.strncasecmp.html"
><B
CLASS="function"
>strncasecmp()</B
></A
>,
     <A
HREF="function.strnatcasecmp.html"
><B
CLASS="function"
>strnatcasecmp()</B
></A
>, <A
HREF="function.strstr.html"
><B
CLASS="function"
>strstr()</B
></A
>, 
     <A
HREF="function.natsort.html"
><B
CLASS="function"
>natsort()</B
></A
> and <A
HREF="function.natcasesort.html"
><B
CLASS="function"
>natcasesort()</B
></A
>.
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