Online PHP editor | rfc for Lfq4C

@ 2017-11-13T05:11:12Z

<?php

// array of characters depending on other characters
$characters = array(
    'a' => array('c'),
    'b' => array('c', 'a'),
    'd' => array('c', 'a'),
    'c' => array(),
    'l' => array('c'),
    'f' => array('l'),
    't' => array('a'),
    'w' => array('c', 'a'),
);

function sortCharacters($characters)
{
    uksort ($characters, function ($a, $b) use ($characters) {
        if (empty($characters[$a]) && empty($characters[$b])) {
            // equal (no dependencies)
            return 0;
        }
        if (empty($characters[$a]) && !empty($characters[$b])) {
            // a has no dependencies so is lower
            return -1;
        }
        if (!empty($characters[$a]) && empty($characters[$b])) {
            // b has no dependencies so a is higher
            return 1;
        }

        if (in_array($a, $characters[$b])) {
            // b depends on a so a is lower
            return -1;
        }

        if (in_array($b, $characters[$a])) {
            // a depends on b so a is higher
            return 1;
        }

        return  0;
    });

    return $characters;
}

$characters = sortCharacters($characters);
print_r($characters);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [c] => Array ( ) [a] => Array ( [0] => c ) [b] => Array ( [0] => c [1] => a ) [d] => Array ( [0] => c [1] => a ) [l] => Array ( [0] => c ) [f] => Array ( [0] => l ) [t] => Array ( [0] => a ) [w] => Array ( [0] => c [1] => a ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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