Online PHP editor | perf for 4uW4R

@ 2014-09-12T17:49:31Z

<?php

function uuid($c = 4) {
    $x = function($c) {
        for ($n = ''; strlen($n) < $c + 1; $n = $n.mt_rand());
        return substr($n, -$c);
    };
    return sprintf(
        '%s-%04d-%04d-%04d-%04d%04d',
        microtime(true), $x($c), $x($c), $x($c), $x($c), $x($c), $x($c)
    );
}

$time = microtime();
$uuids = array();
for ($i = 0; $i < 10000; $i++) {
	$uuids[] = uuid();
}

if (count(array_unique($uuids)) != count($uuids)) {
	echo 'DUPLICATE';
} else {
	echo 'No duplicate';
print_r($uuids);
}

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)
7.2.10	0.253	0.034	18.85
7.2.9	0.102	0.042	18.91
7.2.8	0.358	0.029	18.84
7.2.7	0.192	0.043	18.68
7.2.6	0.165	0.027	19.11
7.2.5	0.129	0.030	19.02
7.2.4	0.136	0.026	19.20
7.1.22	0.232	0.055	17.95
7.1.21	0.100	0.043	17.98
7.1.20	0.181	0.030	18.21
7.1.19	0.152	0.057	18.29
7.1.18	0.098	0.030	17.98
7.1.17	0.182	0.044	18.11
7.0.31	0.184	0.047	17.57
7.0.30	0.199	0.033	17.66
5.6.38	0.048	0.069	19.04
5.6.37	0.043	0.090	19.42
5.6.36	0.034	0.080	18.87

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