What is "echo" in PHP?
PHP echo is a language construct not a function, so you don't need to use parenthesis with it. But if you want to use more than one parameters, it is required to use parenthesis.
The syntax of PHP echo is given below:
void echo ( string $arg1 [, string $... ] )
PHP echo statement can be used to print string, multi line strings, escaping characters, variable, array etc.