Given a tree, removes the keys that are not present in the schema.

Description

It is recursive and modifies the input in-place.

Parameters

$treearrayrequired

Input to process.

$schemaarrayrequired

Schema to adhere to.

Return

Source

$styles_non_top_level = static::VALID_STYLES;
foreach ( array_keys( $styles_non_top_level ) as $section ) {
	// array_key_exists() needs to be used instead of isset() because the value can be null.
	if ( array_key_exists( $section, $styles_non_top_level ) && is_array( $styles_non_top_level[ $section ] ) ) {
		foreach ( array_keys( $styles_non_top_level[ $section ] ) as $prop ) {
			if ( 'top' === $styles_non_top_level[ $section ][ $prop ] ) {
				unset( $styles_non_top_level[ $section ][ $prop ] );
			}
		}
	}
}

// Build the schema based on valid block & element names.
$schema                 = array();
$schema_styles_elements = array();

/*
 * Set allowed element pseudo selectors based on per element allow list.
 * Target data structure in schema:
 * e.g.
 * - top level elements: `$schema['styles']['elements']['link'][':hover']`.

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