How to Resolve \'Serialization of \'Closure\' is Not Allowed\' Exception in Zend Mailer Tests?

Exception: Serialization of 'Closure' is Not Allowed

When running tests that utilize the _initMailer() method, which sets up the Zend initMailer for the application, the following exception is encountered:

Exception: Serialization of 'Closure' is not allowed

The exception arises from the anonymous function (closure) within the method:

$callback = function () {
    return 'ZendMail_' . microtime(true) .'.tmp';
};

Anonymous functions cannot be serialized, leading to the exception.

Solution 1: Replace Closure with a Regular Function

Replace the anonymous function with a regular function:

function emailCallback() {
    return 'ZendMail_' . microtime(true) . '.tmp';
}
$callback = "emailCallback" ;

Solution 2: Indirect Method Call Using Array Variable

Alternatively, you can use an array variable to indirectly call the method:

$callback = array($this, "aMethodInYourClass");

This allows you to specify a method from the class instance without serialization issues.

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