PHP: Under what circumstances is the destructor method __destruct executed?

php Destructor method Under what circumstances is destruct executed? In all cases, is it encountered?>php terminator is also executed

Destructor function Will be executed when all references to a certain object are deleted or when the object is explicitly destroyed

Executed before the object is destroyed Bar?

According to the official manual, the destructor will be executed when all references to an object are deleted or when the object is explicitly destroyed. The code demonstration is as follows

class sf{    public function destruct()
    {        echo METHOD . PHP_EOL;
    }
}


$c1 = new sf;
$c2 = $c1;echo 'unset $c2' . PHP_EOL;unset($c2);echo 'unset $c1' . PHP_EOL;unset($c1);// ----$c1 = new sf;
$c2 = $c1;echo 'null $c2' . PHP_EOL;
$c2 = null;echo 'null $c1' . PHP_EOL;
$c1 = null;// ----$c1 = new sf;
$c2 = $c1;echo '123 $c2' . PHP_EOL;
$c2 = 123;echo '456 $c1' . PHP_EOL;
$c1 = 456;echo 'the end' . PHP_EOL;

The running results are as follows

unset $c2unset $c1
sf::destructnull $c2null $c1
sf::destruct123 $c2456 $c1
sf::destruct
the end

The destructor will be executed when all references to an object are deleted or when the object is explicitly destroyed.

Generally speaking, php will destroy the reference when the script ends (not unset) and runs before the script ends.

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