PHP strncmp() Function

The strncmp() is predefine string function of PHP. It is used to compare two strings. This function strncmp() is binary-safe, case-sensitive and similar to strcmp() function but strcmp() have no the length parameter.

The strncmp () function is often used in programming and web development for string operation.

Syntax:

Parameter	Description	Required/Optional
String1	Specify the first string to compare	Required
String2	Specify the second string to compare	Required
Length	Specify the number of character for comparison.	Required

The strncmp () function:

Returns 0 : if the two string is equal.
Returns <0 : if string 1 is less than string2.
Return >0 : if string1 is greater than string 2.

Example 1

<?php
$str1 = "PHP javatpoint";
$str2 = "PHP javatpoint";
echo "By using 'strcmp()' function:".strcmp($str1, $str2);
// it will return: 0 ( Both string is equall )
 ?>

Output:

By using 'strcmp()' function: 0

Example 2

<?php
 $str1 = "PHP javatpoint";
$str2 = "PHP javatpoint tutorial";
echo "By using 'strcmp()' function:".strcmp($str1, $str2);
// it will return: -9 ( str2 is greater than str1)
 ?>

Output:

By using 'strcmp()' function:-9

Example 3

<?php
$str1 = "PHP javatpoint tutorial";
$str2 = "PHP javatpoint";
echo "By using 'strcmp()' function:".strcmp($str1, $str2);
// it will return: 9 ( str1 is greater than str2)
?>

Output: