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run code in 300+ PHP versions simultaneously
<?php echo $level = strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', get_class(new errorexceptION))); echo PHP_EOL; echo $level = preg_replace('/(?<=\\w)(?=[A-Z])/'," $1", get_class(new errorexceptION));

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34.63 ms | 402 KiB | 5 Q