Online PHP editor | perf for CZjfW

<?php $sos = new SplObjectStorage(); $arr = array(); $docs = array(); $iterations = 50000; for ($i = 0; $i < $iterations; ++$i) { $doc = new DOMDocument(); $docs[] = $doc; } $mem_empty = memory_get_usage(); // Load the SplObjectStorage $start = microtime(true); foreach ($docs as $d) { $sos->attach($d); //$sos[$d] = 1; } $finis = microtime(true); $time_to_fill = $finis - $start; // Check membership on the object storage $start = microtime(true); foreach ($docs as $d) { $sos->contains($d); //isset($sos[$d]); } $finis = microtime(true); $time_to_check = $finis - $start; $mem_spl = memory_get_usage(); $mem_used = $mem_spl - $mem_empty; printf("SplObjectStorage:\nTime to fill: %0.12f ms\nTime to check: %0.12f ms\nMemory: %d\n\n", $time_to_fill * 1000, $time_to_check * 1000, $mem_used); unset($sos); $mem_empty = memory_get_usage(); // Load the array $start = microtime(true); foreach ($docs as $d) { $arr[spl_object_id($d)] = $d; } $finis = microtime(true); $time_to_fill = $finis - $start; // Check membership on the array $start = microtime(true); foreach ($docs as $d) { isset($arr[spl_object_id($d)]); } $finis = microtime(true); $time_to_check = $finis - $start; $mem_arr = memory_get_usage(); $mem_used = $mem_arr - $mem_empty; printf("Arrays:\nTime to fill: %0.12f ms\nTime to check: %0.12f ms\nMemory: %d\n\n", $time_to_fill * 1000, $time_to_check * 1000, $mem_used);

Version	System time (s)	User time (s)	Memory (MiB)
8.4.3	0.044	0.034	40.16
8.3.16	0.068	0.074	71.13
8.2.27	0.081	0.070	71.82
8.1.31	0.075	0.054	72.20
7.4.33	0.042	0.039	39.50
5.6.40	0.056	0.074	54.60