In PHP, you can check if a string is an octal value or not, by using the following regular expression with preg_match()
:
function isOctal(string $str): bool { return preg_match('/^(?:0o|0)[0-7]{1,}$/i', $str); } var_dump(isOctal('030071')); // true var_dump(isOctal('0o30071')); // true (PHP 8.1+) var_dump(isOctal('0O30071')); // true (PHP 8.1+) var_dump(isOctal('030088')); // false var_dump(isOctal('123')); // false
The custom isOctal()
function checks for numeric literals that start with a 0
, 0o
or 0O
, followed by at least one number in the range of 0-7
, and returns boolean true
/false
accordingly.
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