嗨,我需要一些帮助。
// categories for dropdown
$this->data['dropdown_items'] = $this->category_model->get_key_value('id', 'category_name');
我的这一行代码返回一个数组作为键=>值对数组。因此,如果我在屏幕上转储$this>data['dropdown_items'],我会得到这个:
array(8) {
[1] => "cinemas"
[5] => "theaters"
[7] => "night life"
[6] => "restaurants"
[4] => "food"
[2] => "night clubs"
[3] => "opera"
[8] => "misc"
}
i.e [id] => "the category name"
我想做的是将新项目作为此数组的第一个项目前置/添加所以我尝试用array_unshift()函数添加它:
$this->data['dropdown_items'] = array_unshift($this->data['dropdown_items'], "Please select a category");
这就是我想要得到的:
array(8) {
[0] => "Please select a category"
[1] => "cinemas"
[5] => "theaters"
[7] => "night life"
[6] => "restaurants"
[4] => "food"
[2] => "night clubs"
[3] => "opera"
[8] => "misc"
}
但是当我转储$this>data['dropdown_items']时,我得到以下内容
int(9)
任何想法出了什么问题?
替换这个
$this->data['dropdown_items'] = array_unshift($this->data['dropdown_items'], "Please select a category");
跟
array_unshift($this->data['dropdown_items'], "Please select a category");
array_unshit返回数组中的元素数,这就是获取数组计数的原因
array_unshift第一个参数中接收一个引用数组:
array_unshift($this->data['dropdown_items'], "Please select a category");
如果将返回值分配给数组,它将替换为数组中的元素数 (int)。