Online PHP editor | perf for iqUn3

@ 2023-01-17T10:23:00Z

<?php
class Block
{
    public $nonce;

    public function __construct($index, $timestamp, $data, $previousHash = null)
    {
        $this->index = $index;
        $this->timestamp = $timestamp;
        $this->data = $data;
        $this->previousHash = $previousHash;
        $this->hash = $this->calculateHash();
        $this->nonce = 0;
    }

    public function calculateHash()
    {
        return hash("sha256", $this->index.$this->previousHash.$this->timestamp.((string)$this->data).$this->nonce);
    }
}

class BlockChain
{
    /**
     * Instantiates a new Blockchain.
     */
    public function __construct()
    {
        $this->chain = [$this->createGenesisBlock()];
        $this->difficulty = 4;
    }

    /**
     * Creates the genesis block.
     */
    private function createGenesisBlock()
    {
        return new Block(0, strtotime("2017-01-01"), "Genesis Block");
    }

    /**
     * Gets the last block of the chain.
     */
    public function getLastBlock()
    {
        return $this->chain[count($this->chain)-1];
    }

    /**
     * Pushes a new block onto the chain.
     */
    public function push($block)
    {
        $block->previousHash = $this->getLastBlock()->hash;
        $this->mine($block);
        array_push($this->chain, $block);
    }

    /**
     * Mines a block.
     */
    public function mine($block)
    {
        while (substr($block->hash, 0, $this->difficulty) !== str_repeat("0", $this->difficulty)) {
            $block->nonce++;
            $block->hash = $block->calculateHash();
        }

        echo "Block mined: ".$block->hash."\n";
    }

    /**
     * Validates the blockchain's integrity. True if the blockchain is valid, false otherwise.
     */
    public function isValid()
    {
        for ($i = 1; $i < count($this->chain); $i++) {
            $currentBlock = $this->chain[$i];
            $previousBlock = $this->chain[$i-1];

            if ($currentBlock->hash != $currentBlock->calculateHash()) {
                return false;
            }

            if ($currentBlock->previousHash != $previousBlock->hash) {
                return false;
            }
        }

        return true;
    }
}

/*
Set up a simple chain and mine two blocks.
*/

$testCoin = new BlockChain();

echo "mining block 1...\n";
$testCoin->push(new Block(1, strtotime("now"), "amount: 4"));

echo "mining block 2...\n";
$testCoin->push(new Block(2, strtotime("now"), "amount: 10"));

echo json_encode($testCoin, JSON_PRETTY_PRINT);

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
8.4.2	0.007	0.088	22.52
8.4.1	0.003	0.094	24.12
8.3.15	0.003	0.239	17.32
8.3.14	0.007	0.202	17.04
8.3.13	0.007	0.218	16.97
8.3.12	0.007	0.204	19.22
8.3.11	0.003	0.210	16.93
8.3.10	0.007	0.219	20.91
8.3.9	0.010	0.235	16.97
8.3.8	0.003	0.261	17.97
8.3.7	0.017	0.379	18.62
8.3.6	0.013	0.389	18.68
8.3.5	0.010	0.394	17.01
8.3.4	0.013	0.386	20.42
8.3.3	0.010	0.376	18.92
8.3.2	0.007	0.205	24.18
8.3.1	0.003	0.205	24.66
8.3.0	0.003	0.204	26.16
8.2.26	0.010	0.250	17.17
8.2.25	0.007	0.230	18.79
8.2.24	0.003	0.208	17.18
8.2.23	0.003	0.217	20.94
8.2.22	0.010	0.200	24.06
8.2.21	0.010	0.259	26.77
8.2.20	0.000	0.268	16.88
8.2.19	0.010	0.393	16.75
8.2.18	0.010	0.395	16.75
8.2.17	0.007	0.393	19.21
8.2.16	0.010	0.384	22.96
8.2.15	0.010	0.198	25.66
8.2.14	0.010	0.197	24.66
8.2.13	0.003	0.209	26.16
8.2.12	0.003	0.205	20.08
8.2.11	0.010	0.250	22.08
8.2.10	0.003	0.292	17.97
8.2.9	0.000	0.290	18.00
8.2.8	0.000	0.286	17.97
8.2.7	0.010	0.278	18.15
8.2.6	0.003	0.276	19.21
8.2.5	0.007	0.290	18.10
8.2.4	0.000	0.284	20.42
8.2.3	0.003	0.285	18.13
8.2.2	0.003	0.283	19.32
8.2.1	0.004	0.238	17.96
8.2.0	0.003	0.339	18.00
8.1.31	0.003	0.206	16.92
8.1.30	0.003	0.207	20.18
8.1.29	0.013	0.244	18.88
8.1.28	0.013	0.376	25.92
8.1.27	0.003	0.218	20.65
8.1.26	0.003	0.204	26.35
8.1.25	0.000	0.211	28.09
8.1.24	0.013	0.241	19.40
8.1.23	0.010	0.272	20.96
8.1.22	0.007	0.275	17.74
8.1.21	0.000	0.278	18.92
8.1.20	0.003	0.280	17.38
8.1.19	0.000	0.294	17.48
8.1.18	0.007	0.277	18.10
8.1.17	0.007	0.273	18.71
8.1.16	0.003	0.285	19.04
8.1.15	0.003	0.286	18.86
8.1.14	0.007	0.331	17.68
8.1.13	0.010	0.323	17.59
8.1.12	0.003	0.357	17.70
8.1.11	0.010	0.321	17.62
8.1.10	0.003	0.323	17.77
8.1.9	0.007	0.324	17.75
8.1.8	0.007	0.318	17.75
8.1.7	0.007	0.317	17.73
8.1.6	0.000	0.327	17.84
8.1.5	0.007	0.316	17.73
8.1.4	0.007	0.319	17.70
8.1.3	0.007	0.321	17.69
8.1.2	0.010	0.319	17.75
8.1.1	0.007	0.319	17.64
8.1.0	0.000	0.340	17.74
8.0.30	0.003	0.287	19.90
8.0.29	0.000	0.285	17.00
8.0.28	0.007	0.280	18.58
8.0.27	0.007	0.328	17.11
8.0.26	0.003	0.325	16.91
8.0.25	0.010	0.325	16.95
8.0.24	0.003	0.331	17.02
8.0.23	0.000	0.325	17.10
8.0.22	0.000	0.335	16.92
8.0.21	0.007	0.349	17.05
8.0.20	0.007	0.329	17.11
8.0.19	0.010	0.325	17.12
8.0.18	0.003	0.333	17.09
8.0.17	0.003	0.337	17.05
8.0.16	0.003	0.330	17.02
8.0.15	0.003	0.319	16.96
8.0.14	0.000	0.333	16.96
8.0.13	0.003	0.328	16.96
8.0.12	0.003	0.320	17.08
8.0.11	0.003	0.324	17.04
8.0.10	0.003	0.321	17.07
8.0.9	0.000	0.329	17.04
8.0.8	0.003	0.326	16.94
8.0.7	0.010	0.319	16.96
8.0.6	0.007	0.330	16.95
8.0.5	0.003	0.331	16.95
8.0.3	0.000	0.336	16.95
8.0.2	0.003	0.334	17.02
8.0.1	0.003	0.322	17.06
7.4.33	0.007	0.214	16.30

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