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PHP strnatcmp() Function

PHP strnatcmp() function is used to compare two given strings using the "natural order" algorithm. It accepts two strings as input parameter and returns an integer value as output. It is similar to strnatcasecmp() but the only difference is strnatcmp() function is case-sensitive.

Syntax:

strnatcmp( $string1, $string2);

Parameter Values

Parameter	Description
string1	This is a required parameter. This parameter defines the first string to compare.
string2	This is a required parameter. This parameter defines the second string to compare.

Here is an example of strnatcmp() function in PHP:

<html>
<body>

<?php
echo strnatcmp("PHPTPOINT","PHP");  // case sensitive
echo "<br>";
echo strnatcmp("PHPPOINT","PHPTPOINT");
echo "<br>";
echo strnatcmp("PHPTPOINT","PHPTPOINT");

?>

</body>
</html>

Output:
1
-1
0

Here is an another example of strnatcmp() function in PHP:

<html>
<body>

<pre>
<?php
$arr1 = $arr2 = array("1","2","10","001","1000","20","130","200");

echo "Standard string comparison"."<br>";
usort($arr1,"strcmp");

print_r($arr1);

echo "<br>";
echo "<br>";

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

print_r($arr2);
?>
</pre>

</body>
</html>

Output:
Standard string comparison
Array
(
[0] => 001
[1] => 1
[2] => 10
[3] => 1000
[4] => 130
[5] => 2
[6] => 20
[7] => 200
)

Natural order string comparison
Array
(
[0] => 1
[1] => 001
[2] => 2
[3] => 10
[4] => 20
[5] => 130
[6] => 200
[7] => 1000
)

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