Online PHP editor | rfc for j9Reg

@ 2023-05-08T01:51:13Z

<?php

function generator($array, $prefix) {
    foreach ($array as $k => $v) {
        yield $prefix . $k => $v;
    }
}

function generatorPrefix($array, $prefix = 'prefix') {
    return iterator_to_array(generator($array, $prefix));
}

function constructPrefix($array, $prefix = 'prefix') {  // 1 loop over data
    $result = [];
    foreach ($array as $k => $v) {
        $result[$prefix . $k] = $v;
    }
    return $result;
}

function mapKeyAndCombinePrefix($array, $prefix = 'prefix') {  // 3 loops over data
    return array_combine(
               array_map(
                   fn($k) => $prefix . $k,
                   array_keys($array)
               ),
               $array
           );
}

function walkPrefix($array, $prefix = 'prefix') {  // 1 loop over data
    $result = [];
    array_walk(
        $array,
        function($v, $k, $prefix) use (&$result) {
            $result[$prefix . $k] = $v;
        },
        $prefix
    );
    return $result;
}

function reducePrefix($array, $prefix = 'prefix') {  // 2 loops over data
    return array_reduce(
               array_keys($array),
               function($result, $k) use ($array, $prefix) {
                   $result[$prefix . $k] = $array[$k];
                   return $result;
               },
               []
           );
}

function returnTime(callable $function, int $repeat = 20)
{
    $tests = [];
    for ($i = 0; $i < $repeat; ++$i) {
        $startTime = microtime(true);
        $function();
        $endTime = microtime(true);
        $tests[] = $endTime - $startTime;
    }
    // Representing the average
    return 1000 * array_sum($tests) / $repeat;
}

$array = range(0, 5000);

foreach (['generatorPrefix', 'constructPrefix', 'mapKeyAndCombinePrefix', 'walkPrefix', 'reducePrefix'] as $test) {
    echo "Duration of $test: ", returnTime(fn() => $test($array)) . PHP_EOL;
}

Output for git.master: Duration of generatorPrefix: 0.56370496749878 Duration of constructPrefix: 0.37879943847656 Duration of mapKeyAndCombinePrefix: 0.55135488510132 Duration of walkPrefix: 0.79895257949829 Duration of reducePrefix: 49.132585525513
Output for git.master_jit: Duration of generatorPrefix: 0.56980848312378 Duration of constructPrefix: 0.36269426345825 Duration of mapKeyAndCombinePrefix: 0.56769847869873 Duration of walkPrefix: 0.81355571746826 Duration of reducePrefix: 49.228310585022

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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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