3v4l.org

run code in 300+ PHP versions simultaneously

@ 2013-06-11T08:37:09Z

<?php

    /**
    * take the range of characters and generate a string of all permutations
    *
    * @param array $range      range of characters to itterate over
    * @param array $array      input array - operated on by reference
    * @param int $depth        how many chars to put in the resultant array should be
    * @param int $currentDepth internal variable to track how nested the current call is
    * @param string $prefix    internal variable to know what to prefix the current string with
    * @return string           permutations
    */
    function foo($range, &$array, $depth = 1, $currentDepth = 0, $prefix = "") {
        $start = !$currentDepth;
        $currentDepth++;

        if ($currentDepth > $depth) {
            return;
        }

        foreach($range as $char) {
            if ($currentDepth === $depth) {
                $array[] = $prefix . $char;
                continue;
            }

            foo($range, $array, $depth, $currentDepth, $prefix . $char);
        }

        if ($start) {
            return implode($array, "\n");
        }
    }

    $return = array();
    echo foo(range('a', 'z'), $return, 2);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in /in/DOVNs:31 Stack trace: #0 /in/DOVNs(31): implode(Array, '\n') #1 /in/DOVNs(36): foo(Array, Array, 2) #2 {main} thrown in /in/DOVNs on line 31
Process exited with code 255.

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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

preferences:dark modelive preview

50.88 ms | 401 KiB | 8 Q