Static variable index of PHP class, php static variable index_PHP tutorial

Static variable index of PHP class, php static variable index

Directly enter the code

<?php
class example{
    public static $pa;
    public $pb;
    public function __construct(){
        $this->pb = ++self::$pa;
    }
}

$a = new example;
$b = new example;

echo $a->pb;
echo '<hr/>';
echo $b->pb;
?>

Originally I thought the result should be

<span>1</span>
-----------------------------------------------------
<span>1</span>

But I was wrong, The correct result is

<span>1</span>
----------------------------------------------------------------------------------
<span>2</span>

If you haven’t learned the basics well, make up for it as soon as possible

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