PHP：Hashtable优化

Question

I have two static hashtables in my program:

public static $labels = [
    'id' => 'ID',
    'name' => 'Name',
    'email' => 'E-mail',
    'password' => 'Password',
];

public static $columnTypes = [
    'id' => 'number',
    'name' => 'text',
    'email' => 'text',
    'password' => 'text',
];

First is for the labels of the database columns and the second for each type (necessary for filtering).

My problem is that I often need to get the type of a column by its label what leads to speed issues (hashtables are pretty slow in this direction right?).

My approaches would be the following:

1. Type a hashtable label => type which is bad because I have to repeat myself and there is no support for other languages
2. Create the label => type hashtable in a static content on runtime (is this possible in php?)

Are there better approaches or best practices for this issue and is the second approach possible in php? (maybe with a small example ;)

Answer 1

Call array_flip in the class constructor. To avoid repeating it, check whether the flipped array is already set.

class YourClass {
    public static $labels = [
        'id' => 'ID',
        'name' => 'Name',
        'email' => 'E-mail',
        'password' => 'Password',
    ];
    public static $labels_flipped = null;

    public function __construct() {
        if (!$labels_flipped) {
            $labels_flipped = array_flip($labels);
        }
        ...
    }
}