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filter_block_content() WP 5.3.1

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

No Hooks.


String. The filtered and sanitized content result.


filter_block_content( $text, $allowed_html, $allowed_protocols );
$text(string) (required)
Text that may contain block content.
An array of allowed HTML elements and attributes, or a context name such as 'post'.
Array of allowed URL protocols.


Since 5.3.1 Introduced.

Code of filter_block_content() WP 5.7.2

function filter_block_content( $text, $allowed_html = 'post', $allowed_protocols = array() ) {
	$result = '';

	$blocks = parse_blocks( $text );
	foreach ( $blocks as $block ) {
		$block   = filter_block_kses( $block, $allowed_html, $allowed_protocols );
		$result .= serialize_block( $block );

	return $result;