Alert: 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.

_mce_set_direction( array $mce_init )

Set the localized direction for MCE plugin.


Will only set the direction to ‘rtl’, if the WordPress locale has the text direction set to ‘rtl’.

Fills in the ‘directionality’ setting, enables the ‘directionality’ plugin, and adds the ‘ltr’ button to ‘toolbar1’, formerly ‘theme_advanced_buttons1’ array keys. These keys are then returned in the $mce_init (TinyMCE settings) array.

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(array) (Required) MCE settings array.

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(array) Direction set for 'rtl', if needed by locale.

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File: wp-includes/functions.php

function _mce_set_direction( $mce_init ) {
	if ( is_rtl() ) {
		$mce_init['directionality'] = 'rtl';
		$mce_init['rtl_ui']         = true;

		if ( ! empty( $mce_init['plugins'] ) && strpos( $mce_init['plugins'], 'directionality' ) === false ) {
			$mce_init['plugins'] .= ',directionality';

		if ( ! empty( $mce_init['toolbar1'] ) && ! preg_match( '/\bltr\b/', $mce_init['toolbar1'] ) ) {
			$mce_init['toolbar1'] .= ',ltr';

	return $mce_init;

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Version Description
2.1.0 Introduced.

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