Wordpress/tests/phpunit/includes/plural-form-function.php

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<?php
/**
* Legacy plural form function.
*
* @param int $nplurals
* @param string $expression
*/
function tests_make_plural_form_function( $nplurals, $expression ) {
$closure = function ( $n ) use ( $nplurals, $expression ) {
$expression = str_replace( 'n', $n, $expression );
// phpcs:ignore Squiz.PHP.Eval -- This is test code, not production.
$index = (int) eval( 'return ' . $expression . ';' );
return ( $index < $nplurals ) ? $index : $nplurals - 1;
};
return $closure;
}