Extracts all meta tag content attributes from a file and returns an array
get_meta_tags ( string $filename [, bool $use_include_path = FALSE ] ) : array
The path to the HTML file, as a string. This can be a local file or a URL.
Setting use_include_path to TRUE will result in PHP trying to open the file along the standard include path as per the include_path directive. This is used for local files, not URLs.
Returns an array with all the parsed meta tags. The value of the name property becomes the key, the value of the content property becomes the value of the returned array, so you can easily use standard array functions to traverse it or access single values. Special characters in the value of the name property are substituted with '_', the rest is converted to lower case. If two meta tags have the same name, only the last one is returned.
[viewport] => width=device-width, initial-scale=1.0
[author] => author
[keywords] => keywords
[description] => description
[special_characters] => special characters to underscore
[uppercase] => uppercase to lowercase
[same] => same only returns last