使用 MYSQL 查询创建 PHP 全局变量

Question

I am trying to use a query in WP as a Global variable ( yes I know to avoid those if possible, but This is a query I am going to reference over and over so to me it makes more sense then writing out the same query with each function). I must be missing something because the global variable doesn't seem to be working. How I defined the variable:

    $query =  $wpdb->get_results("SELECT columnn1, column2 FROM mytablename");

function query() {
  global $query;
        return $query;
    };

Then when referencing it in a function later I used:

fucntion xyz{
    $results = $query;
//does things
}

Have I done something wrong? It isn't working.

EDIT 1:

   $query =  $wpdb->get_results("SELECT columnn1, column2

FROM mytablename");

function query() {
  global $query;
        return $query;
    };

Then when referencing it in a function later I used:

fucntion xyz{
global $query
    $results = $query;
//does things
}

Answer 1

try this

function query() use ($query) {
    // do something with global variable $query
    return $query;
};

Answer 2

you can use $GLOBALS['query'] to access the global value of query variable. say you have a function where you want to use the query variable

$query = "Some string"; 
function use_query_here() {     
    global $query;     
    $results = $query;     //Use $results here now or you can use $query also directly but if will risk mutating its value <br /> 
}

OR

function use_query_here() {
    $result = $GLOBALS['query'];     // Use $result variable here now 
}