fwolf / base-converter.php

benchmark/compare-map-assign.php

<?php
/**
 * @copyright   Copyright 2016 Fwolf
 * @license     http://opensource.org/licenses/MIT MIT
 */

echo <<<TAG
Compare speed of array assign(initialize), used om base convert maps.


TAG;


$directAssign = function() {
    $map = [
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
        'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
        'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
    ];

    $reverseMap = [
        '0' => 0,   '1' => 1,   '2' => 2,   '3' => 3,   '4' => 4,
        '5' => 5,   '6' => 6,   '7' => 7,   '8' => 8,   '9' => 9,
        'a' => 10,  'b' => 11,  'c' => 12,  'd' => 13,  'e' => 14,
        'f' => 15,  'g' => 16,  'h' => 17,  'i' => 18,  'j' => 19,
        'k' => 20,  'l' => 21,  'm' => 22,  'n' => 23,  'o' => 24,
        'p' => 25,  'q' => 26,  'r' => 27,  's' => 28,  't' => 29,
        'u' => 30,  'v' => 31,  'w' => 32,  'x' => 33,  'y' => 34,
        'z' => 35,
        'A' => 36,  'B' => 37,  'C' => 38,  'D' => 39,  'E' => 40,
        'F' => 41,  'G' => 42,  'H' => 43,  'I' => 44,  'J' => 45,
        'K' => 46,  'L' => 47,  'M' => 48,  'N' => 49,  'O' => 50,
        'P' => 51,  'Q' => 52,  'R' => 53,  'S' => 54,  'T' => 55,
        'U' => 56,  'V' => 57,  'W' => 58,  'X' => 59,  'Y' => 60,
        'Z' => 61,
    ];

    return true || $map || $reverseMap;

The expression $map of type string[] is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

The expression $reverseMap of type array<string,integer> is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

};


$arrayMerge = function () {
    $map = array_merge(
        ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'],
        ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm'],
        ['n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'],
        ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M'],
        ['N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
    );

    $reverseMap = array_merge(
        ['0' => 0,   '1' => 1,   '2' => 2,   '3' => 3,   '4' => 4],
        ['5' => 5,   '6' => 6,   '7' => 7,   '8' => 8,   '9' => 9],
        ['a' => 10,  'b' => 11,  'c' => 12,  'd' => 13,  'e' => 14],
        ['f' => 15,  'g' => 16,  'h' => 17,  'i' => 18,  'j' => 19],
        ['k' => 20,  'l' => 21,  'm' => 22,  'n' => 23,  'o' => 24],
        ['p' => 25,  'q' => 26,  'r' => 27,  's' => 28,  't' => 29],
        ['u' => 30,  'v' => 31,  'w' => 32,  'x' => 33,  'y' => 34],
        ['z' => 35],
        ['A' => 36,  'B' => 37,  'C' => 38,  'D' => 39,  'E' => 40],
        ['F' => 41,  'G' => 42,  'H' => 43,  'I' => 44,  'J' => 45],
        ['K' => 46,  'L' => 47,  'M' => 48,  'N' => 49,  'O' => 50],
        ['P' => 51,  'Q' => 52,  'R' => 53,  'S' => 54,  'T' => 55],
        ['U' => 56,  'V' => 57,  'W' => 58,  'X' => 59,  'Y' => 60],
        ['Z' => 61]
    );

    return true || $map || $reverseMap;

The expression $map of type string[] is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

The expression $reverseMap of type array<string,integer> is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

};


$arrayFlip = function () {
    $map = array_merge(
        ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'],
        ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm'],
        ['n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'],
        ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M'],
        ['N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
    );

    $reverseMap = array_flip($map);

    return true || $map || $reverseMap;

The expression $map of type string[] is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

The expression $reverseMap of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

};


$loopAssign = function() {
    $dict = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

    $map = [];
    $reverseMap = [];
    for ($i = 0; $i < 62; $i++) {
        $char = $dict{$i};
        $map[] = $char;
        $reverseMap[$char] = $i;
    }

    return true || $map || $reverseMap;

The expression $map of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

The expression $reverseMap of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

};


$maxLoop = 100000;
$time1 = $_SERVER["REQUEST_TIME_FLOAT"];

for ($i = 0; $i < $maxLoop; $i++) {
    $directAssign();
}
$time2 = microtime(true);

for ($i = 0; $i < $maxLoop; $i++) {
    $arrayMerge();
}
$time3 = microtime(true);

for ($i = 0; $i < $maxLoop; $i++) {
    $arrayFlip();
}
$time4 = microtime(true);

for ($i = 0; $i < $maxLoop; $i++) {
    $loopAssign();
}
$time5 = microtime(true);


echo "Direct array assign: " . ($time2 - $time1) . PHP_EOL;
echo "  Use array_merge(): " . ($time3 - $time2) . PHP_EOL;
echo "   Use array_flip(): " . ($time4 - $time3) . PHP_EOL;
echo "  Loop array assign: " . ($time5 - $time4) . PHP_EOL;

/**
 * Example result:

Direct array assign: 0.94509100914001
  Use array_merge(): 1.7523620128632
   Use array_flip(): 1.3521640300751
  Loop array assign: 3.1361529827118

 */