MimeType::fromExtension( string $extension ): self

Source

public static function fromExtension(string $extension): self
{
    $extension = strtolower($extension);
    if (!isset(self::$extensionMap[$extension])) {
        throw new InvalidArgumentException(sprintf('Unknown file extension: %s', $extension));
    }
    return new self(self::$extensionMap[$extension]);
}

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