PHP uses the 'natural' algorithm to compare two strings (case sensitive) with the function strnatcmp()

Parameter examples

Use the "natural" algorithm to compare two strings (case sensitive):

<?php
echo strnatcmp("2Hello world!","10Hello world!");
echo "<br>";
echo strnatcmp("10Hello world!","2Hello world!");
?>

Definition and usage

strnatcmp() function uses a A "natural" algorithm to compare two strings (case sensitive).

In natural algorithms, the number 2 is less than the number 10. In computer sorting, 10 is less than 2 because the first number in 10 is less than 2.

Note: This function is case-sensitive.

Syntax

strnatcmp(string1,string2)

Technical details

Example 1

The difference between natural algorithm (strnatcmp) and conventional computer string sorting algorithm (strcmp):

<?php
$arr1 = $arr2 = array("pic1","pic2","pic10","pic01","pic100","pic20","pic30","pic200");
echo "Standard string comparison"."<br>";
usort($arr1,"strcmp");

print_r($arr1);
echo "<br>";

echo "Natural order string comparison"."<br>";
usort($arr2,"strnatcmp");

print_r($arr2);
?>

Case

<?php
echo strnatcmp("2Hello world!","10Hello world!");
echo "<br />";
echo strnatcmp("10Hello world!","2Hello world!");
?>

The output of the code above will be:

The above code will output the following result: -1 1

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