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# PHP strnatcmp() Function [ PHP String Reference Manual](#) ## Example Compare two strings using a "natural" algorithm (case-sensitive): <?php echo strnatcmp("2Hello world!","10Hello world!"); echo "
"; echo strnatcmp("10Hello world!","2Hello world!"); ?> [Run Example »](#) * * * ## Definition and Usage The strnatcmp() function compares two strings using a "natural" algorithm (case-sensitive). In the natural algorithm, the number 2 is less than the number 10. In computer sorting, 10 is less than 2, because the first digit in 10 is less than 2. **Note:** This function is case-sensitive. * * * ## Syntax strnatcmp(_string1,string2_) | Parameter | Description | | --- | --- | | _string1_ | Required. Specifies the first string to compare. | | _string2_ | Required. Specifies the second string to compare. | ## Technical Details | Return Value: | The function returns: * 0 - if the two strings are equal * 0 - if string1 is greater than string2 | | :--- | | PHP Version: | 4+ | * * * ## More Examples ## Example 1 The difference between the natural algorithm (strnatcmp) and the standard computer string sorting algorithm (strcmp): <?php $arr1 = $arr2 = array("pic1","pic2","pic10","pic01","pic100","pic20","pic30","pic200"); echo "Standard string comparison"."
"; usort($arr1,"strcmp"); print_r($arr1); echo "
"; echo "Natural order string comparison"."
"; usort($arr2,"strnatcmp"); print_r($arr2); ?> [Run Example »](#) * * PHP String Reference Manual](#)