strnatcasecmp

(PHP 4, PHP 5, PHP 7, PHP 8)

strnatcasecmp — Case insensitive string comparisons using a "natural order" algorithm

Description

strnatcasecmp(string $string1, string $string2): int

This function implements a comparison algorithm that orders alphanumeric strings in the way a human being would. The behaviour of this function is similar to strnatcmp(), except that the comparison is not case sensitive. For more information see: Martin Pool's » Natural Order String Comparison page.

Parameters

string1

The first string.

string2

The second string.

Return Values

Similar to other string comparison functions, this one returns -1 if string1 is less than string2 1 if string1 is greater than string2, and 0 if they are equal.

Changelog

Version Description
8.2.0 This function now returns -1 or 1, where it previously returned a negative or positive number.

Examples

Example #1 strnatcasecmp() example

<?php

var_dump(strnatcasecmp('Apple', 'Banana'));
var_dump(strnatcasecmp('Banana', 'Apple'));
var_dump(strnatcasecmp('apple', 'Apple'));
?>

The above example will output:

int(-1)
int(1)
int(0)

See Also

  • preg_match() - Perform a regular expression match
  • strcmp() - Binary safe string comparison
  • strcasecmp() - Binary safe case-insensitive string comparison
  • substr() - Return part of a string
  • stristr() - Case-insensitive strstr
  • strncasecmp() - Binary safe case-insensitive string comparison of the first n characters
  • strncmp() - Binary safe string comparison of the first n characters
  • strstr() - Find the first occurrence of a string
  • setlocale() - Set locale information