translate() │ WP 2.2.0

Retrieve the translation of $text.

If there is no translation, or the text domain isn't loaded, the original text is returned.

Note: Don't use translate() directly, use __() or related functions.

Uses: get_translations_for_domain(), MO()
Used By: __(), _e(), esc_html__(), esc_html_e()
Hooks from the function

Return

String. Translated text.

Usage

translate( $text, $domain );
$text(string) (required)
Text to translate.
$domain(string)
Text domain. Unique identifier for retrieving translated strings.
Default: 'default'

Changelog

Since 2.2.0 Introduced.
Since 5.5.0 Introduced gettext-{$domain} filter.

Code of translate() WP 6.0

wp-includes/l10n.php 
function translate( $text, $domain = 'default' ) {
	$translations = get_translations_for_domain( $domain );
	$translation  = $translations->translate( $text );

	/**
	 * Filters text with its translation.
	 *
	 * @since 2.0.11
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( 'gettext', $translation, $text, $domain );

	/**
	 * Filters text with its translation for a domain.
	 *
	 * The dynamic portion of the hook name, `$domain`, refers to the text domain.
	 *
	 * @since 5.5.0
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( "gettext_{$domain}", $translation, $text, $domain );

	return $translation;
}

Very rarely used (trash)

localize (l10n i18n Internationalization localization)

Localization