How to Resolve Serialization Exceptions with Closures in Zend Mail Transport?

Serialization Exception with Closures

Problem:

When using closures in the _initMailer method, tests fail with the exception: "Serialization of 'Closure' is not allowed."

Cause:

Anonymous functions cannot be serialized. In the provided code, a closure is used as the callback parameter for the Zend_Mail_Transport_File transport.

Solution 1: Replace Closure with a Regular Function

Replace the closure with a regular function defined outside the _initMailer method. For example:

<code class="php">function emailCallback() {
    return 'ZendMail_' . microtime(true) . '.tmp';
}

$callback = "emailCallback";</code>

Solution 2: Use Indirect Method Call via Array Variable

Alternatively, you can use an array variable to indirectly call a method in your class as the callback. Refer to the Zend Mail documentation for more details:

<code class="php">$callback = array($this, "aMethodInYourClass");</code>

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