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@ 2021-01-16T23:08:04Z

<?php

$i = 0;

function is_cyclic(array &$array)
{
    global $i;
    
    // Exit when too deep.
    if (++$i > 10) exit;
    
    echo "Call $i:\n";
    var_dump($array);
    echo "\n";
    
    $lastKey = array_key_last($array);
    if ($lastKey === null) {
        // Array is empty
        return false;
    }
    static $marker;
    if ($marker === null) {
        $marker = new stdClass();
    }
    if ($array[$lastKey] === $marker) {
        return true;
    }
    $array[] = $marker;
    foreach ($array as &$item) {
        if (is_array($item) && is_cyclic($item)) {
            //array_pop($array);
            return true;
        }
    }
    //array_pop($array);
    return false;
}

function craft_bomb() {
    $array = [1, [2, 3]];
    $array[1][1] = &$array;
    return $array;
}

$bomb = craft_bomb();
is_cyclic($bomb);

Output for git.master, git.master_jit, rfc.property-hooks: Call 1: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 2: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 3: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 4: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 5: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 6: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 7: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 8: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 9: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 10: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } }

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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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