with PHP, several methods are available to produce output:

    echo "hello world\n";
    print "hello world\n";
    print_r("hello world\n");
    var_export("hello world\n");

However all these methods have something in common: they do not produce their
own newline. With each method, the user is required to provide a newline with
"\n", PHP_EOL or similar. This is bothersome because many other programming
languages offer such a method. For example Python:

    print('hello world')

Perl:

    use feature say;
    say 'hello world';

Ruby:

    puts 'hello world'

Lua:

    print 'hello world'

Even C:

    #include <stdio.h>
    int main() {
       puts("hello world");
    }

To resolve, implement PHP "println" function.