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PHP strnatcmp() Function

PHP String Reference Complete PHP String Reference

Definition and Usage

The strnatcmp() function compares two strings using a "natural" algorithm.

In a natural algorithm, 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.

This function returns:

  • 0 - if the two strings are equal
  • <0 - if string1 is less than string2
  • >0 - if string1 is greater than string2

Syntax

strnatcmp(string1,string2)

Parameter Description
string1 Required. Specifies the first string to compare
string2 Required. Specifies the second string to compare

Tips and Notes

Note: The strnatcmp() is case-sensitive.

Example

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

The output of the code above will be:

-1
1

PHP String Reference Complete PHP String Reference
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