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<?php function callstacksayswhat() { var_dump(memory_get_peak_usage()); } function my_length(string $a): int { var_dump(memory_get_peak_usage()); return strlen($a); } $a = str_repeat("a", 100_000); callstacksayswhat(); echo "after init--------\n"; var_dump(memory_get_peak_usage()); my_length($a); my_length($a); my_length($a); my_length($a); my_length($a);