Explain it.

Question

$x = 5;
echo $x;
echo "<br />";
echo $x+++$x++;
echo "<br />";
echo $x;
echo "<br />";
echo $x---$x--;
echo "<br />";
echo $x;

:: output ::

5
11
7
1
5

Answer 1

Here:

$x = 5;
echo $x;
prints 5

echo "<br />";
echo $x+++$x++;

$x+++ is 5+5 = 10
$x++ is 10+1 =11
prints 11

echo "<br />";
echo $x;
prints 7

echo "<br />";
echo $x---$x--;

$x--- is 7-5=2
$x-- is 2-1= 1
prints 1

echo "<br />";
echo $x;

prints 5