Online PHP editor | perf for Manqu

@ 2018-09-28T12:27:27Z

<?php

// makes a big map
$map = [];
for($a = 0; $a < 55555; $a++){
   $map["key" . $a] = (object)(array)["x" => $a];
} 

// empty the map (or partially empty it)
for($a = 0; $a < 55555; $a++){
   unset($map["key" . $a]);
}

// at this point $map's length is nexPow2(55555), even if it is empty

$om = memory_get_usage();
echo $om . "\n";

(function(array $map){
    $map["sup"] = "copy";
    
    // copy on write allocates another nexPow2(55555) array,
    // rather than starting with a small one
    
    $nm = memory_get_usage();
    echo $nm . "\n";
})($map);

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	0.300	0.053	41.21
7.2.9	2.545	0.026	37.49
7.2.8	1.032	0.032	41.25
7.2.7	0.939	0.052	41.45
7.2.6	2.487	0.013	22.29
7.2.5	0.158	0.061	41.61
7.2.4	0.505	0.052	41.69
7.2.3	2.379	0.023	20.39
7.1.22	1.731	0.056	40.55
7.1.21	1.189	0.036	40.33
7.1.20	2.489	0.016	22.52
7.1.19	1.640	0.040	40.64
7.1.18	1.168	0.075	40.50
7.1.17	0.774	0.062	40.71
7.1.16	2.725	0.022	29.42
7.1.15	2.483	0.003	18.96
5.6.38	0.011	0.006	13.69

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