How Can I Simulate Immediately Invoked Function Expressions (IIFE) in PHP?

Immediately Invoked Function Expression (IIFE) in PHP?

In JavaScript, Immediately Invoked Function Expression (IIFE) executes a function immediately upon definition. Users seek a similar functionality in PHP.

Can PHP Closures Simulate IIFE?

Notably, PHP 7 introduces support for IIFE. The following expression demonstrates this:

<code class="php">(function() { echo "yes, this works in PHP 7.\n"; })();</code>

However, for PHP 5.x, an alternative workaround involves using call_user_func:

<code class="php">call_user_func(function() { echo "this works too\n"; });</code>

This approach allows for immediate execution of anonymous functions, resembling IIFE's behavior in JavaScript.

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