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<?php $val = "209810563658809344"; echo sprintf('%0.0f', ($val - 1)) . '<br />'; echo bcsub($val, 1) . '<br />'; $val = "355325317306527744"; echo sprintf('%0.0f', ($val - 1)) . '<br />'; echo bcsub($val, 1) . '<br />';

preferences:
29.12 ms | 402 KiB | 5 Q