Logic or problem one! Solution Solutions

Logic or problem one!!
$a = 0;
$b = 0;
if ($a =3 | | $b =3) {
$a + +;
$b + +;
}
echo $a. ', '. $b; Output
?>

His explanation is $ A = (3 | | $b = 3).
This explanation is right?
Http://school.youth.cn/2012/0509/5670.html
In addition | | What is the meaning? --I can't find Baidu.

if | | The front is true, and the back is executed--.

Foundation is not good, forgive me!!

------Solution--------------------
operator | | is logical OR, = is an assignment operator, from the operator precedence defined by PHP, the operator | | is greater than operator =, so
($a = 3 | | $b = 3) This expression will be evaluated first | | operator. | | is a two-dollar operator, and either side is true, the result of the operation is true, and the expression is evaluated first (3 | | A value of $b = 3), and then assign the value to $ A. And in PHP, 3 > 0, so | | The result on the left side of the operator is true, the right ($b = 3) You can ignore because there is already one side for true, so (3 | | The result of $b = 3) is true,
Then assign true to $ A, $a = true.

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