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<?php $values = [ 'string-blank' => ' ', 'string-empty' => '', 'string-leading-zero' => '01', 'string-word' => 'foo', ]; var_dump(array_map(static function (string $value): bool { return ctype_digit($value); }, $values));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { ["string-blank"]=> bool(false) ["string-empty"]=> bool(false) ["string-leading-zero"]=> bool(true) ["string-word"]=> bool(false) }

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