The strcoll() is an inbuilt function in PHP and is used to compare two strings. This function is case-sensitive which points that capital and small cases will be treated differently, during a comparison. This function compares two strings and tells us that whether the first string is greater or smaller than the second string or equals to the second string. Syntax:

strcoll($string1, $string2)

Parameters:The function accepts two mandatory string parameters which are described below.

1. $string1: This parameter refers to the first string to be used in the comparison.
2. $string2: This parameter refers to the second string to be used in the comparison.

Return Value: The function returns a random integer value depending on the condition of match, which is given by:

• Returns 0 if the strings are equal.
• Returns a negative value (<0), if $string1 is lesser than $string2.
• Returns a positive value (>0) if $string2 is lesser than $string1.

Examples:

Input : $string1 = "geeks for geeks" $string2="geeks for geeks"
Output : 0 

Input : $string1 = "striver" $string2="raj" 
Output : 1 

Below programs illustrate the use of strcoll() function: Program 1: The below program demonstrates the return value when two equal strings are passed

<?php
    //PHP program to compare two strings using 
    // strcoll() function (two strings are equal)
    $string1 = "geeks for geeks";
    $string2 = "geeks for geeks";
    
    // prints 0 as two strings are equal
    echo strcoll($string1, $string2);
?>

Output:

0

Program 2: The below program demonstrates the return value when string1 is greater than string2

<?php
    //PHP program to compare two strings using 
    // strcoll() function (string1>string2)
    $string1 = "striver";
    $string2 = "raj";
    
    // prints > 0 
    echo strcoll($string1, $string2);
?>

Output:

1

Program 3: The below program demonstrates the return value when string2 is greater than string1

<?php
    //PHP program to compare two strings using 
    // strcoll() function (string2>string1)
    $string1 = "CPP";
    $string2 = "PHP";
    
    // prints <0
    echo strcoll($string1, $string2);
?>

Output:

-13

Reference: http://php.net/manual/en/function.strcoll.php