Test if the PHP default timezone is set to UTC.

Helper function to check if a file name could match an existing image sub-size file name.

Filters and sanitizes block content to remove non-allowable HTML from parsed block attribute values.

Filters and sanitizes a parsed block to remove non-allowable HTML from block attribute values.

Filters and sanitizes a parsed block attribute value to remove non-allowable HTML.

Returns the content of a block, including comment delimiters.

Filters an inline style attribute and removes disallowed rules.

Returns the content of a block, including comment delimiters, serializing all attributes from the given parsed block.

Given an array of attributes, returns a string in the serialized attributes format prepared for post content.

Returns a joined string of the aggregate serialization of the given parsed blocks.