PHP Deprecated Warning – yii\base\ErrorException strlen(): Passing null to parameter #1 ($string) of type string is deprecated

[newadventure079]

Prerequisites

• [x] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• [x] The issue still exists against the latest master branch of yii2-icons.
• [x] This is not an usage question. I confirm having gone through and read the documentation and demos.
• [x] This is not a general programming / coding question. (Those should be directed to the webtips Q & A forum).
• [x] I have attempted to find the simplest possible steps to reproduce the issue.
• [ ] I have included a failing test as a pull request (Optional).

Steps to reproduce the issue

1. Use yii 2.0.45 with php 8.1
2. Include Icon::map($this);

Expected behavior and actual behavior

When I follow those steps, I see...

PHP Deprecated Warning – yii\base\ErrorException
strlen(): Passing null to parameter #1 ($string) of type string is deprecated
1. in /Users/Documents/code/htdocs/remv2/vendor/kartik-v/yii2-icons/src/Icon.phpat line 169

     * @var string $framework the framework to be used with the application
     * @var string $method the method in the Icon class (defaults to `show`)
     * @returns string the icon framework key
     * @throws InvalidConfigException
     * @return string
     */
    protected static function getFramework($framework = null, $method = 'show')
    {
        $len = strlen($framework);  <--- error here
        if ($len > 0 && !in_array($framework, array_keys(self::$_frameworks))) {
            $replace = ['{framework}' => $framework, '{method}' => 'Icon::' . $method];
            throw new InvalidConfigException(strtr(self::FRAMEWORK_INVALID, $replace));
        }
        if ($len > 0) {
            return $framework;
        }
        if ($len === 0 && empty(Yii::$app->params['icon-framework'])) {
            throw new InvalidConfigException(self::PARAM_NOT_SET);

I was expecting... The page to load without errors

Environment

Browsers

• [x] Google Chrome
• [ ] Mozilla Firefox
• [ ] Internet Explorer
• [ ] Safari

Operating System

• [ ] Windows
• [x] Mac OS X
• [ ] Linux
• [ ] Mobile

Libraries

• jQuery version:
• yii2-icons version: 1.4.7

Isolating the problem

• [ ] This bug happens on the demos page
• [x] The bug happens consistently across all tested browsers
• [ ] This bug happens when using yii2-icons without other plugins.