Detailed introduction and example code of PHP search query function

I encountered a problem today: When using the "Search" function, the query cannot be performed after entering the query conditions.
What I am doing is to display the content in the data table package on the homepage, but there is a condition. The content displayed on the homepage must also be: field status=0, and data with printing=0 can be displayed in the homepage list.
There is a "search" function on the page. After entering the conditions, the query will be carried out based on the conditions.
For general search, just give one in the homepage display list method index():

$map=array();//初始化查询条件
$map=$this->_search();//调用查询方法
$total = $this->Model->where ($map)->count(); //这个主要是用来计算页面显示数据条数的
if ($total == 0) {
$_list = '';
} else {
$_list = $this->Model->where ($map)->limit( $post_data ['first'] . ',' . $post_data ['rows'] )->select();
}

Then, just write a _search():
such as:

protected function _search(){
$map = array ();
$post_data = I ( 'post.' );
if ($post_data ['packageid'] != '') {
$map ['packageid'] = array (
'like',
'%' . $post_data ['packageid'] . '%' 
);
}
return $map;
}

Finally, call this search method in the "Search" menu of settings.
However, when I do this, while searching, I also need to make sure to search in the data with field status=0 and printing=0.
I have been thinking about where to add this restriction. After various attempts and inquiries, I found out. Restrictions can be added directly to the SQL statement (as shown in red below). (When I tried it myself, I kept adding conditions in the blue area below, and failed every time!)

$map=array();
$map=$this->_search();
$total = $this->Model->where ($map)->where(array('status' =>0,'print_status'=>0))->count();
if ($total == 0) {
$_list = '';
} else {
$_list = $this->Model->where ($map)->where(array('status' =>0,'print_status'=>0))->limit( $post_data ['first'] . ',' . $post_data ['rows'] )->select();
}

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