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@ 2024-12-03T19:53:57Z

<?php

class RecursionDetector {
    private array $obj_ref_stack = [];
    private array $arr_ref_stack = [];

    public function detect(&$val): bool {
        switch (gettype($val)) {
            case 'object':
                $hash = spl_object_hash($val);
                var_dump($hash);
                if (isset($this->obj_ref_stack[$hash])) {
                    debug_print_backtrace();
                    return true;
                }
                $this->obj_ref_stack[$hash] = true;
                $copy = (array) $val;
                break;
            case 'array':
                $ref = ReflectionReference::fromArrayElement([&$var], 0)->getId();
                if (isset($this->arr_ref_stack[$ref])) {
                    debug_print_backtrace();
                    return true;
                }
                $this->arr_ref_stack[$ref] = true;
                $copy = $val;
                break;
            default:
                return false;
        }
    
        $recurse = false;
    
        foreach ($copy as $k => $_) {
            if ($this->detect($copy[$k])) {
                $recurse = true;
                break;
            }
        }
        
        switch (gettype($val)) {
            case 'object':
                unset($this->obj_ref_stack[$hash]);
                break;
            case 'array':
                unset($this->arr_ref_stack[$ref]);
                break;
        }

        return $recurse;
    }
}

$d = new RecursionDetector();

class X {
    public array $y = [];
}

$x = new X();

$r = new ReflectionClass('X');
$z = $r->newLazyProxy(fn() => $x);

$x->y[] = [[$z]];
$_ = $z->y;

var_dump($x, $z);
var_dump($d->detect($x));
var_dump($d->detect($z));

Output for git.master_jit, git.master: object(X)#2 (1) { ["y"]=> array(1) { [0]=> array(1) { [0]=> array(1) { [0]=> lazy proxy object(X)#5 (1) { ["instance"]=> *RECURSION* } } } } } lazy proxy object(X)#5 (1) { ["instance"]=> object(X)#2 (1) { ["y"]=> array(1) { [0]=> array(1) { [0]=> array(1) { [0]=> *RECURSION* } } } } } string(32) "00000000000000020000000000000000" string(32) "00000000000000050000000000000000" string(32) "00000000000000050000000000000000" #0 /in/Ad9CN(35): RecursionDetector->detect(Object(X)) #1 /in/Ad9CN(35): RecursionDetector->detect(Array) #2 /in/Ad9CN(35): RecursionDetector->detect(Array) #3 /in/Ad9CN(35): RecursionDetector->detect(Array) #4 /in/Ad9CN(35): RecursionDetector->detect(Object(X)) #5 /in/Ad9CN(35): RecursionDetector->detect(Array) #6 /in/Ad9CN(35): RecursionDetector->detect(Array) #7 /in/Ad9CN(35): RecursionDetector->detect(Array) #8 /in/Ad9CN(69): RecursionDetector->detect(Object(X)) bool(true) string(32) "00000000000000050000000000000000" string(32) "00000000000000050000000000000000" #0 /in/Ad9CN(35): RecursionDetector->detect(Object(X)) #1 /in/Ad9CN(35): RecursionDetector->detect(Array) #2 /in/Ad9CN(35): RecursionDetector->detect(Array) #3 /in/Ad9CN(35): RecursionDetector->detect(Array) #4 /in/Ad9CN(70): RecursionDetector->detect(Object(X)) bool(true)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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