function lex1()
{
print "Hello";
return 1;
}
function lex2()
{
print "World";
return 1;
}
if (lex1() || lex2()) {}

it only print "Hello", so lex2() never been executed.

So, u can also write :

if (
    @function1() &&
    @function2() &&
    @function3() &&
    @function4() &&
    @function5()) {}

It will do all functions from 1 to 5 but terminated immediately if one of
the function is failed.

LexZEUS

for beginners like me!
don't forget that if you want a=b, it has to be a==b
for example 

<?
$a=2;
$b=2;
if ($a== $b)
echo "that's right!";
?>

and read the manual!

You can also use this syntax:
(it worked out for me)

if (conditional):
//sentences
elseif(conditional2):
//sentences
else:
//more sentences
endif;

You can also use this if/else condition structure
to control an index navigation page statement
and extract partial rows from an array.

// Init to control pointer into the array

$setlimit = 10; // rows limit
$pointer = 0; // this is the start pointer value
$next = $pointer + $setlimit; // increment the pointer
$prev= $next - $setlimit; // decrement the pointer
$total_rows = mysql_num_rows($myrows); // total rows

// You're at the beginning
if (($pointer == 0) && ($total_rows > $setlimit)):

echo"$next >>";

// You're in the middle
elseif ($next < $total_rows):

echo"<< $prev";
echo"$pointer";
echo"$next >>";

// You're in a selection with only one row
elseif (($next == $total_rows) && ($next > $total_rows)):

// You're at the end
else:

echo"<< $prev";

endif;