Description:
------------
---
From manual page: http://www.php.net/function.echo
---

"""
// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10);
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n";
"""

"Some people prefer"? And is or isn't there a reason for that?
According to http://www.mdproductions.ca/guides/50-best-practices-to-optimize-php-code-performance
the first is more efficient.

If that is true, it is of huge importance that it is mentioned ("Some people prefer .... because it's faster")
If it's not, then it's worth stating that it is a false myth ("Some people prefer... but it makes no difference")

In other words,
Either they are equivalent, in which case you should replace "Some people prefer" with "The following are equivalent" or "produce the exact same result", or they are not, in which case the differences or advantages (other than mere taste) of one over the other need to be clarified.