_n( string $single, string $plural, int $number, string $domain = 'default' )

Translates and retrieves the singular or plural form based on the supplied number.

Description

Used when you want to use the appropriate form of a string based on whether a number is singular or plural.

Example:

printf( _n( '%s person', '%s people', $count, 'text-domain' ), number_format_i18n( $count ) );

Parameters

$single

(string) (Required) The text to be used if the number is singular.

$plural

(string) (Required) The text to be used if the number is plural.

$number

(int) (Required) The number to compare against to use either the singular or plural form.

$domain

(string) (Optional) Text domain. Unique identifier for retrieving translated strings.

Default value: 'default'

Return

(string) The translated singular or plural form.

Source

File: wp-includes/l10n.php 

function _n( $single, $plural, $number, $domain = 'default' ) {
	$translations = get_translations_for_domain( $domain );
	$translation  = $translations->translate_plural( $single, $plural, $number );

	/**
	 * Filters the singular or plural form of a string.
	 *
	 * @since WP-2.2.0
	 *
	 * @param string $translation Translated text.
	 * @param string $single      The text to be used if the number is singular.
	 * @param string $plural      The text to be used if the number is plural.
	 * @param string $number      The number to compare against to use either the singular or plural form.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	return apply_filters( 'ngettext', $translation, $single, $plural, $number, $domain );
}

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Changelog

Changelog
Version Description
WP-2.8.0 Introduced.