wp_kses_one_attr()

wp_kses_one_attr( string $attr, string $element ): string

function wp_kses_one_attr( $attr, $element ) {
	$uris              = wp_kses_uri_attributes();
	$allowed_html      = wp_kses_allowed_html( 'post' );
	$allowed_protocols = wp_allowed_protocols();
	$attr              = wp_kses_no_null( $attr, array( 'slash_zero' => 'keep' ) );

	// Preserve leading and trailing whitespace.
	$matches = array();
	preg_match( '/^\s*/', $attr, $matches );
	$lead = $matches[0];
	preg_match( '/\s*$/', $attr, $matches );
	$trail = $matches[0];
	if ( empty( $trail ) ) {
		$attr = substr( $attr, strlen( $lead ) );
	} else {
		$attr = substr( $attr, strlen( $lead ), -strlen( $trail ) );
	}

	// Parse attribute name and value from input.
	$split = preg_split( '/\s*=\s*/', $attr, 2 );
	$name  = $split[0];
	if ( count( $split ) === 2 ) {
		$value = $split[1];

		/*
		 * Remove quotes surrounding $value.
		 * Also guarantee correct quoting in $attr for this one attribute.
		 */
		if ( '' === $value ) {
			$quote = '';
		} else {
			$quote = $value[0];
		}
		if ( '"' === $quote || "'" === $quote ) {
			if ( ! str_ends_with( $value, $quote ) ) {
				return '';
			}
			$value = substr( $value, 1, -1 );
		} else {
			$quote = '"';
		}

		// Sanitize quotes, angle braces, and entities.
		$value = esc_attr( $value );

		// Sanitize URI values.
		if ( in_array( strtolower( $name ), $uris, true ) ) {
			$value = wp_kses_bad_protocol( $value, $allowed_protocols );
		}

		$attr  = "$name=$quote$value$quote";
		$vless = 'n';
	} else {
		$value = '';
		$vless = 'y';
	}

	// Sanitize attribute by name.
	wp_kses_attr_check( $name, $value, $attr, $vless, $element, $allowed_html );

	// Restore whitespace.
	return $lead . $attr . $trail;
}