How to Resolve \"Exception: Serialization of \'Closure\' is Not Allowed\" Error Using Closures in Test Methods?

Exception: Serialization of 'Closure' is Not Allowed

When attempting to use closures within test methods, an "Exception: Serialization of 'Closure' is not allowed" error may occur.

Problem

The code fragment below uses a closure to specify a custom file path for storing emails:

<code class="php">protected function _initMailer() {
    ...
    elseif ('testing' === APPLICATION_ENV) {
        // ...
        $callback = function()
        {
            return 'ZendMail_' . microtime(true) .'.tmp';
        };
        // ...
    }</code>

Resolution

Solution 1: Replace Closure with Regular Function

Replace the closure with a regular function:

<code class="php">protected function _initMailer() {
    ...
    elseif ('testing' === APPLICATION_ENV) {
        // ...
        function emailCallback() {
            return 'ZendMail_' . microtime(true) . '.tmp';
        }
        $callback = "emailCallback";
        // ...
    }</code>

Solution 2: Use Array Variable for Indirect Method Call

Utilize an array variable to call a method indirectly:

<code class="php">protected function _initMailer() {
    ...
    elseif ('testing' === APPLICATION_ENV) {
        // ...
        $callback = array($this, "aMethodInYourClass");
        // ...
    }</code>

This allows you to define the method within the class and pass it to the callback using an array.

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