Online PHP editor | output for 8j0ql

@ 2017-07-06T09:22:39Z

<?php

$funcs = [
    function ($array)
    {
        end($array);
        $key = key($array);
        reset($array);
        return $key;
    },

    function ($array)
    {
        return count($array) - 1;
    },

    function ($array)
    {
        return key(array_slice($array,-1,1,true));
    },
    
    function ($array) {
        $keys = array_keys($array);
        return end($keys);
    }
];

$test = ['a', 'b', 'c', 'd', 'e'];

foreach ($funcs as $f) {
    $results = [];
    for ($i = 0; $i < 10000; $i++) {
        $start_time = microtime(TRUE);

        $f($test);
        
        $end_time = microtime(TRUE);
        
        $results[] = $end_time - $start_time;
    }
    
    echo sprintf('%f.4', array_sum($results) / count($results)) . PHP_EOL;
}

Output for 7.0.4, 7.1.3 - 7.1.4, 7.1.10, 7.2.0 - 7.2.6: 0.000000.4 0.000000.4 0.000000.4 0.000000.4
Output for 7.0.2, 7.0.19, 7.1.7: 0.000001.4 0.000001.4 0.000001.4 0.000001.4
Output for 7.0.20, 7.1.6: 0.000002.4 0.000001.4 0.000001.4 0.000001.4
Output for 7.0.5, 7.0.7 - 7.0.8, 7.0.12 - 7.0.16, 7.0.18, 7.1.0 - 7.1.2, 7.1.5: 0.000001.4 0.000000.4 0.000001.4 0.000001.4
Output for 7.0.17: 0.000002.4 0.000000.4 0.000001.4 0.000001.4
Output for 7.0.11: 0.000001.4 0.000001.4 0.000002.4 0.000002.4
Output for 7.0.1, 7.0.10: 0.000001.4 0.000000.4 0.000002.4 0.000001.4
Output for 7.0.9: 0.000002.4 0.000001.4 0.000001.4 0.000002.4
Output for 7.0.6: 0.000001.4 0.000000.4 0.000001.4 0.000002.4
Output for 7.0.3: 0.000000.4 0.000000.4 0.000000.4 0.000001.4
Output for 7.0.0: 0.000000.4 0.000000.4 0.000001.4 0.000000.4

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