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wp_apply_custom_classname_support is private and should not be used in themes or plugins directly.

wp_apply_custom_classname_support › WordPress Function

Since5.6.0

Deprecatedn/a

› wp_apply_custom_classname_support ( $block_type, $block_attributes )

Access:	private
Parameters: (2)	(WP_Block_Type) $block_type Block Type. Required: Yes (array) $block_attributes Block attributes. Required: Yes
Returns:	(array) Block CSS classes and inline styles.
Defined at:	wp-includes/block-supports/custom-classname.php , line 44
Codex:	developer.wordpress.org / wp_apply_custom_classname_support

Adds the custom classnames to the output.

Source

function wp_apply_custom_classname_support( $block_type, $block_attributes ) {
	$has_custom_classname_support = block_has_support( $block_type, 'customClassName', true );
	$attributes                   = array();
	if ( $has_custom_classname_support ) {
		$has_custom_classnames = array_key_exists( 'className', $block_attributes );

		if ( $has_custom_classnames ) {
			$attributes['class'] = $block_attributes['className'];
		}
	}

	return $attributes;
}