The strnatcasecmp Function

The strnatcasecmp function performs a comparison of two strings case-insensitively, using a natural ordering algorithm (natural order). The first parameter passes the first string for comparison, the second - the second string. The function returns 0 if the strings are identical, a number -1 if the first string is less than the second, and a number greater than 1 if the first string is greater than the second.

Syntax

phpstrnatcasecmp(string1, string2);

Example

Let's compare two identical strings case-insensitively:

php<?php
  $res = strnatcasecmp('Hello', 'hello');
  echo $res;
?>

Code execution result:

php0

Example

Let's compare strings with numbers using natural ordering:

php<?php
  $res = strnatcasecmp('file2.txt', 'file10.txt');
  echo $res;
?>

Code execution result:

php-1

Example

Comparing strings with different character cases:

php<?php
  $res = strnatcasecmp('Apple', 'banana');
  echo $res;
?>

Code execution result:

php-1

See Also