How can the function t1s1 be modified to update the variable $t1s1 in the main script properly?

The issue arises because the function t1s1 is not returning the updated value of $t1s1 to the main script. To solve this, we can modify the function to return the updated value of $t1s1 and then assign it back to $t1s1 in the main script.

// Function t1s1 modified to return the updated value
function t1s1($t1s1) {
    // Perform some operations to update $t1s1
    $t1s1 += 10;
    
    return $t1s1;
}

// Assign the updated value of $t1s1 back to the variable in the main script
$t1s1 = t1s1($t1s1);