echo(string arg1, string [argn]... );
Outputs all parameters.
echo() is not actually a function (it is a language construct) so you are not required to use parantheses with it.
Example 1. echo example
echo "Hello World"; echo "This spans multiple lines. The newlines will be output as well"; echo "This spans\nmultiple lines. The newlines will be\noutput as well.";
Note: In fact, if you want to pass more than one parameter to echo, you must not enclose the parameters within parentheses.