<?php $iters = 500; $arr = range(0, 40_000); $t = microtime(true); foreach (range(0, $iters) as $i) { $arr = array_merge($arr, [$i => 'x']); } echo round((microtime(true) - $t) * 3, 3) . ' ms' . "\n"; $t = microtime(true); foreach (range(0, $iters) as $i) { $arr = [...$arr, $i => 'x']; } echo round((microtime(true) - $t) * 3, 3) . ' ms' . "\n"; $t = microtime(true); foreach (range(0, $iters) as $i) { $arr = [$i => 'x', ...$arr]; } echo round((microtime(true) - $t) * 3, 3) . ' ms' . "\n"; $t = microtime(true); foreach (range(0, $iters) as $i) { $arr[$i] = 'y'; } echo round((microtime(true) - $t) * 3, 3) . ' ms' . "\n"; var_dump(count($arr)); // dummy use of $arr variable
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