PHP strncmp Function: Binary‑Safe String Comparison

Function: int strncmp(string $str1, string $str2, int $len) – binary‑safe comparison of the beginning of two strings up to a specified length.

Description: The function works like strcmp() but allows you to limit the number of characters compared. It is case‑sensitive.

Parameters: $str1: first string. $str2: second string. $len: maximum number of characters to compare.

Return value: Returns <0 if $str1 is less than $str2, >0 if greater, and 0 if they are equal within the specified length.

Example 1:

<?php
    echo strncmp("Hello world!", "Hello earth!", 6);
?>

Output: // 0 Example 2:

<?php
echo strncmp("Hello", "Hello", 6);
echo "<br>";
echo strncmp("Hello", "hELLo", 6);
?>

Output:

// 0
// -1