String function Library: strnatcmp

strnatcmp

(PHP4 >= 4.0rc2)

STRNATCMP---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; Using natural order algorithms to compare strings

Syntax: int strnatcmp (String str1, String str2)

Description:

This function performs a comparison algorithm, which is arranged according to the letters and numbers, which is described as a "natural ordering". The following examples illustrate the difference between this algorithm and the general string routing algorithms (using strcmp ()):

Example:

<?php

$arr 1 = $arr 2 = Array ("Img12.png", "Img10.png", "Img2.png", "img1.png");

echo "Standard string comparison\n";

Usort ($arr 1, "strcmp"); Print_r ($arr 1);

echo "\nnatural order string comparison\n";

Usort ($arr 2, "strnatcmp");

Print_r ($arr 2);

?>

The example above will produce the following results:

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 please refer to: Martin Pool's Natural Order String Comparison page.

Similar to other string-matching functions, if the str1 is less than str2, returns a value less than 0, and returns a value greater than 0 if the str1 is greater than str2, and returns 0 if the two strings are equal.

Note: The comparison of this function is case-sensitive

Reference: Ereg () strcasecmp () substr () Stristr () strcmp () strncmp () strnatcasecmp ()