Language: PHP
Label: vulnerable
CWE: CWE-829 \u2014 Inclusion of Functionality from Untrusted Control Sphere
The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.

Code:
function save_query($query) {
    global $table_prefix;	// table prefix;
    global $conn;			// MySQL connection variable.
    $query = json_encode($query);
    $conn->query("INSERT INTO {$table_prefix}latest_queries (query_value) VALUES ($query)");

}