php - 如何向 usort/uasort cmp 函数添加额外的参数？

Question

我想在 compare_by_flags 函数中使用这个 $sort_flags 数组，但我没有找到方法，这可能吗？

public function sort_by_rank(array $sort_flags = array()) {
    uasort($this->search_result_array, array($this, 'compare_by_flags'));
}

private static function compare_by_flags($a, $b) {
    // I want to have this $sort_flags array here to compare according to those flags      
}

Answer 1

如果你使用 php < 5.3 那么你可以只使用实例变量:

public function sort_by_rank(array $sort_flags = array()) {
    $this->sort_flags = $sort_flags;
    uasort($this->search_result_array, array($this, 'compare_by_flags'));
}

private static function compare_by_flags($a, $b) {
    // I want to have this $sort_flags array here to compare according to those flags      
}

否则 - 使用闭包:

public function sort_by_rank(array $sort_flags = array()) {
    uasort($this->search_result_array, function($a, $b) use ($sort_flags) {
        // your comparison
    });
}