[PHP] Różnica zapisie warunku if() Opcje

[kari]

Mam takie pytanie. Jaka jest różnica w takim zapytaniu:

[PHP] pobierz, plaintext 
if () {
   echo 'wiadomość';
}
[PHP] pobierz, plaintext 

a takim:

[PHP] pobierz, plaintext 
if () echo 'wiadomość';
[PHP] pobierz, plaintext 

?
Czy ta druga wersja jest poprawna?

[nospor]

Przecież masz to w manualu opisane :/
http://pl2.php.net/manual/en/control-structures.if.php

Often you'd want to have more than one statement to be executed conditionally. Of course, there's no need to wrap each statement with an if clause. Instead, you can group several statements into a statement group. For example, this code would display a is bigger than b if $a is bigger than $b, and would then assign the value of $a into $b:
<?php
if ($a > $b) {
echo "a is bigger than b";
$b = $a;
}
?>