Online PHP editor | rfc for qqiO5

@ 2015-03-27T10:03:05Z

<?php
/**
 * @param string $T  the string to re-order
 * @param string $O  the string that specifies the desired order
 * @return string  the re-ordered $T
 */
function reorder($T, $O)
{
    // Convert $T and $O to arrays of characters
    $t = str_split($T);
    $o = str_split($O);

    // Compute the index of each character from $T in $O
    // Use -1 for characters that do not appear in $O
    $m = array_map(function($x) use ($o) {
            $p = array_search($x, $o);
            return ($p === FALSE) ? -1 : $p;
        },
        $t
    );

    // Sort $m and $t simultaneously; $t will follow the changes applied to $m
    array_multisort($m, $t);

    // Join the sorted characters of $T back and return as string
    return implode('', $t);
}

$order = 'eloh';
echo('hello => '.reorder('hello', $order)."\n");
echo('help  => '.reorder('help', $order)."\n");

Output for git.master, git.master_jit, rfc.property-hooks: hello => elloh help => pelh

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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