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<?php function createInstance() { return new class {}; } $startMemory = memory_get_peak_usage(); for ($i = 0; $i < 10000; $i++) { createInstance(); } var_dump((memory_get_peak_usage() - $startMemory) / 1024**2); // MB
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
int(0)

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93.24 ms | 406 KiB | 5 Q