How to Achieve Immediate Execution of Anonymous Functions in PHP?

Achieving Immediate Execution of Anonymous Functions in PHP

In JavaScript, anonymous functions provide a convenient way to execute code immediately upon definition. This pattern is defined as follows:

<code class="javascript">(function () { /* do something */ })()</code>

However, in PHP, this syntax doesn't work directly. To emulate this behavior, we have two primary options:

PHP Versions Prior to 7:

For PHP versions before 7, leveraging call_user_func() is a viable solution:

<code class="php">call_user_func(function() { echo 'executed'; });</code>

This approach wraps the anonymous function within call_user_func() to execute it immediately.

PHP Versions 7 and Higher:

Modern versions of PHP introduce arrow functions, which provide a more concise way to execute anonymous functions instantly:

<code class="php">(function() { echo 'executed'; })();</code>

This syntax allows for immediate execution without the need for call_user_func().

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