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<?php function func(string $str): string { while(strpos($str, '.') !== 0 && strrpos($str, '0') == strlen($str)) { $str = substr($str, 0, strlen($str) - 1); } return $str; } echo func('20.0000000000000000000000000000000000000010000') . PHP_EOL; var_dump(func('2.123000') === '2.123'); var_dump(func('2.0') === '2'); var_dump(func('123') === '123'); var_dump(func('20') === '20'); var_dump(func('') === '20.000000000000000000000000000000000000001');
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