Slow array function used in loop: research recursive functions support

[kalessil]

https://3v4l.org/cNpt9

<?php
class Foo {
    public $parent;
    public function __construct($parent = null) {
        $this->parent = $parent;
    }
}

$a = new Foo();
$b = new Foo($a);
$c = new Foo($b);

$x = [1, 2, 3];

/*
 * In cases like this you can do a simplified analysis:
 * - Detect if a function contains BOTH array_merge and a recursive call
 * - Detect if the return value is derived from the array_merge method
 */
function flatHash(Foo $x) {
    $hash = [spl_object_hash($x)];

    if (!$x->parent) {
        return $hash;
    }

    return array_merge($hash, flatHash($x->parent));
}

var_dump(flatHash($c));
var_dump(flatHash($b));
var_dump(flatHash($a));

[stale[bot]]

Bebo beep, the StaleBot is here. For one year nothing have happened here. It would be great if someone looked into details here within next 21 days when I'll close it.

[andreasschroth]

Sounds like a good idea to me, should be kept open. @stalebot

[andreasschroth]

Please reopen.

[kalessil]

Reopening

[romanstingler]

array merge vs array unpack php8.1+ https://3v4l.org/1PS65#v8.3.13