The strncasecmp Function

The strncasecmp function performs a case-insensitive comparison of the first specified n characters of two strings. It returns 0 if the substrings are equal, a negative number if the first string is less than the second, and a positive number if the first string is greater.

Syntax

strncasecmp(string $str1, string $str2, int $length): int

Example

Case-insensitive comparison of the first 4 characters:

<?php
	$res = strncasecmp("Hello", "HELP me", 4);
	echo $res;
?>

Code execution result:

0

Example

Comparison with a case difference:

<?php
	$res = strncasecmp("apple", "APRICOT", 3);
	echo $res;
?>

Code execution result (negative number, because 'p' < 'R'):

-8

Example

Case-insensitive prefix check:

<?php
	$header = "Content-Type: application/json";
	if (strncasecmp($header, "content-type:", 12) === 0) {
		echo "Заголовок Content-Type найден";
	}
?>

Code execution result:

"Заголовок Content-Type найден"

The strncasecmp Function

Syntax

Example

Example

Example

See Also