Online PHP editor | rfc for r0YIe

@ 2022-01-03T05:44:25Z

<?php

$names = [
    'ab1 ab2', // becomes ba1 ba2
    'qwerty uçop', // becomes ytrewq poçu
    'q1werty% uio*pl', // becomes y1trewq% lpo*iu
    'Привет, мир!', // becomes тевирП, рим!
    'Hello, dear @user_non-name, congrats100 points*@!', // olleH, raed @eman_non-resu, stragnoc100 stniop*@!
    'a'
];

function swapLetterPositions($string): string {
    $result = [];
    foreach (explode(' ', $string) as $index => $word) {
        $result[$index] = '';
        $count = preg_match_all('/(\pL)|(.)/u', $word, $m, PREG_SET_ORDER);
        for ($i = 0, $j = $count; $i < $count; ++$i) {
            if (!$m[$i][1]) { // immovable
                $result[$index] .= $m[$i][2]; // append to string
            } else {  // movable from front
                while (--$j >= 0) {
                    if ($m[$j][1]) { // movable from back
                        $result[$index] .= $m[$j][1]; // append to string
                        break;
                    }
                }
            }
        }
    }
    return implode(' ', $result);
}

foreach ($names as $name) {
    echo "\"$name\" => \"" . swapLetterPositions($name) . "\"\n---\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: "ab1 ab2" => "ba1 ba2" --- "qwerty uçop" => "ytrewq poçu" --- "q1werty% uio*pl" => "y1trewq% lpo*iu" --- "Привет, мир!" => "тевирП, рим!" --- "Hello, dear @user_non-name, congrats100 points*@!" => "olleH, raed @eman_non-resu, stargnoc100 stniop*@!" --- "a" => "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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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