   #PHP Manual String functions strnatcasecmp strncasecmp

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                                   strnatcmp

   (PHP 4 )
   strnatcmp --  String comparisons using a "natural order" algorithm

Description

   int strnatcmp ( string str1, string str2)

   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
   strcmp()) can be seen below:

   <?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);
   ?>

   The code above will generate the following output:

Standard string comparison
Array
(
    [0] => img1.png
    [1] => img10.png
    [2] => img12.png
    [3] => img2.png
)

Natural order string comparison
Array
(
    [0] => img1.png
    [1] => img2.png
    [2] => img10.png
    [3] => img12.png
)

   For more information see: Martin Pool's Natural Order String
   Comparison page.

   Similar to other string comparison functions, this one returns < 0 if
   str1 is less than str2; > 0 if str1 is greater than str2, and 0 if
   they are equal.

   Note that this comparison is case sensitive.

   See also ereg(), strcasecmp(), substr(), stristr(), strcmp(),
   strncmp(), strncasecmp(), strnatcasecmp(), strstr(), natsort() and
   natcasesort().
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