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	 * Generates a random string of given length from characters specified in second argument.
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	 * Generates a random string of given length from characters specified in second argument.
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	 * Supports intervals, such as `0-9` or `A-Z`.
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	 * Supports intervals, such as `0-9` or `A-Z`.
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	 */
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	 */
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	public static function generate(int $length = 10, string $charlist = '0-9a-z'): string
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	public static function generate(int $length = 10, string $charlist = '0-9a-z'): string
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	{
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	{
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		$charlist = count_chars(preg_replace_callback('#.-.#', function (array $m): string {
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		$charlist = preg_replace_callback(
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			'#.-.#',
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			return implode('', range($m[0][0], $m[0][2]));
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			fn(array $m): string => implode('', range($m[0][0], $m[0][2])),
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		}, $charlist), 3);
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			$charlist,
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		);
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		$charlist = count_chars($charlist, mode: 3);
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		$chLen = strlen($charlist);
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		$chLen = strlen($charlist);
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		if ($length < 1) {
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		if ($length < 1) {
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			throw new Nette\InvalidArgumentException('Length must be greater than zero.');
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			throw new Nette\InvalidArgumentException('Length must be greater than zero.');