Online PHP editor | perf for b5lXg

@ 2018-09-06T16:22:25Z

<?php

/**
 * Generate a random string, using a cryptographically secure 
 * pseudorandom number generator (random_int)
 * 
 * per https://stackoverflow.com/a/31107425
 */
function get_random_string($length = 16, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
{
    $str = '';
    $max = mb_strlen($keyspace, '8bit') - 1;
    for ($i = 0; $i < $length; ++$i) {
        $str .= $keyspace[random_int(0, $max)];
    }
    return $str;
}

// Tests.
echo 'Test 01: ' . get_random_string() . "\n";
echo get_random_string(2) . "\n";
echo get_random_string(32) . "\n";
echo get_random_string(16, '1234567') . "\n";
echo get_random_string(16, '123abcABC') . "\n";
echo get_random_string(16, 'ABC') . "\n";
echo get_random_string(16, '10') . "\n";

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)
7.2.9	0.003	0.017	14.90
7.2.8	0.747	0.010	14.62
7.2.7	0.540	0.010	14.80
7.2.6	0.476	0.007	14.93
7.2.5	0.513	0.003	14.79
7.2.4	0.407	0.007	14.98
7.2.3	0.461	0.003	15.14
7.2.2	0.395	0.013	14.95
7.2.1	0.364	0.013	14.98
7.2.0	0.416	0.010	14.87
7.1.21	0.078	0.010	13.94
7.1.20	0.018	0.009	14.07
7.1.19	0.457	0.010	13.79
7.1.18	0.438	0.019	14.03
7.1.17	0.409	0.003	13.80
7.1.16	0.494	0.013	13.86
7.1.15	0.421	0.012	13.94
7.1.14	0.367	0.013	13.80
7.1.13	0.403	0.007	13.80
7.1.12	0.447	0.007	14.03
7.1.11	0.396	0.010	13.89
7.1.10	0.394	0.003	13.88
7.1.9	0.560	0.003	14.09
7.1.8	0.439	0.013	14.00
7.1.7	0.529	0.010	14.00
7.1.6	0.527	0.013	31.96
7.1.5	0.639	0.016	31.77
7.1.4	0.792	0.006	31.76
7.1.3	0.688	0.013	31.80
7.1.2	0.634	0.016	32.00
7.1.1	0.690	0.013	13.88
7.1.0	0.520	0.013	13.75

preferences:dark modelive preview