echo('foo', 'bar') throws syntax error

[adamjimenez]

echo with multiple parameters causes a syntax error

echo('foo', 'bar');

Syntax error, unexpected ','

[baconbrad]

This is exactly how PHP handles an echo with multiple parameters.

[adamjimenez]

I think it's a PHP7 thing.
The manual states:
void echo ( string $arg1 [, string $... ] )