WP_Duotone::colord_parse_rgba_string( string $input ): array|null

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Parses a valid RGB[A] CSS color function/string

Description

Direct port of colord’s parseRgbaString function.

Parameters

$inputstringrequired
The RGBA string to parse.

Return

array|null An array of RGBA values or null if the RGB string is invalid.

Source

private static function colord_parse_rgba_string( $input ) {
	// Functional syntax.
	$is_match = preg_match(
		'/^rgba?\(\s*([+-]?\d*\.?\d+)(%)?\s*,\s*([+-]?\d*\.?\d+)(%)?\s*,\s*([+-]?\d*\.?\d+)(%)?\s*(?:,\s*([+-]?\d*\.?\d+)(%)?\s*)?\)$/i',
		$input,
		$match
	);

	if ( ! $is_match ) {
		// Whitespace syntax.
		$is_match = preg_match(
			'/^rgba?\(\s*([+-]?\d*\.?\d+)(%)?\s+([+-]?\d*\.?\d+)(%)?\s+([+-]?\d*\.?\d+)(%)?\s*(?:\/\s*([+-]?\d*\.?\d+)(%)?\s*)?\)$/i',
			$input,
			$match
		);
	}

	if ( ! $is_match ) {
		return null;
	}

	/*
	 * For some reason, preg_match doesn't include empty matches at the end
	 * of the array, so we add them manually to make things easier later.
	 */
	for ( $i = 1; $i <= 8; $i++ ) {
		if ( ! isset( $match[ $i ] ) ) {
			$match[ $i ] = '';
		}
	}

	if ( $match[2] !== $match[4] || $match[4] !== $match[6] ) {
		return null;
	}

	return self::colord_clamp_rgba(
		array(
			'r' => (float) $match[1] / ( $match[2] ? 100 / 255 : 1 ),
			'g' => (float) $match[3] / ( $match[4] ? 100 / 255 : 1 ),
			'b' => (float) $match[5] / ( $match[6] ? 100 / 255 : 1 ),
			'a' => '' === $match[7] ? 1 : (float) $match[7] / ( $match[8] ? 100 : 1 ),
		)
	);
}

Changelog

VersionDescription
6.3.0Introduced.

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