PHP Manual: Binary safe string comparison of the first n characters

Description

int strncmp(string $string1, string $string2, int $length)

This function is similar to strcmp, with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.

Note that this comparison is case sensitive.

Parameters

string1: The first string.
string2: The second string.
length: Number of characters to use in the comparison.

Return Values

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 strncmp example

<?php

$var1 = 'Hello John';
$var2 = 'Hello Doe';
if (strncmp($var1, $var2, 5) === 0) {
    echo 'First 5 characters of $var1 and $var2 are equal in a case-sensitive string comparison';
}
?>

strncmp

Description

Parameters

Return Values

Changelog

Examples

See Also