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 ) {
$expression = str_replace( 'n', '$n', $expression );
$func_body = "
\$index = (int)($expression);
return (\$index < $nplurals)? \$index : $nplurals - 1;";
// phpcs:ignore WordPress.PHP.RestrictedPHPFunctions.create_function_create_function
return create_function( '$n', $func_body );
}