(PHP 4 >= 4.0.0)
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:
$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);
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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
)
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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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