function foo ($arg_1, $arg_2) {
    echo "Example function.\n";
}
	

function foo ($arg_1, $arg_2) {
    echo "Example function.\n";
    return $arg_1;
}

$answer=foo($a,$b);
echo $answer;
	

function foo() {
    echo "In foo()
\n";
}

function bar( $arg = '' ) {
    echo "In bar(); argument was '$arg'.
\n";
}

$func = 'foo';
$func();
$func = 'bar';
$func( 'test' );