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

Exception: Serialization of 'Closure' is Not Allowed

When executing tests that involve closure functions in Zend's _initMailer method, developers may encounter the following exception: Exception: Serialization of 'Closure' is not allowed.

This error arises because anonymous functions cannot be serialized due to their dynamic nature. In the provided code, the closure is defined within the _initMailer method:

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

Solution:

There are two viable solutions to this issue:

Solution 1: Replace with a Normal Function

Convert the closure to a normal function outside the _initMailer method:

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

Solution 2: Indirect Method Call by Array Variable

According to the Zend Mail File Transport documentation, the callback option can also be set using an array variable:

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

This approach allows for passing any method from the current class as a callback.

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