Can Functions be Stored in PHP Arrays?

Storing Functions in PHP Arrays

Question:

Can a function be stored in a PHP array?

Answer:

Yes, it is possible to store a function in a PHP array. There are several approaches to do this:

• Anonymous Function:

<code class="php">$functions = [
  'function1' => function ($echo) {
    echo $echo;
  }
];</code>

• String Reference to an Existing Function:

<code class="php">function do_echo($echo) {
  echo $echo;
}

$functions = [
  'function1' => 'do_echo'
];</code>

• Deprecated create_function Method (PHP < 5.3):

<code class="php">$functions = [
  'function1' => create_function('$echo', 'echo $echo;')
];<p>Once stored in an array, the function can be called directly or via call_user_func:</p>
<pre class="brush:php;toolbar:false"><code class="php">$functions['function1']('Hello world!');

call_user_func($functions['function1'], 'Hello world!');</code>

Best Alternative:

The recommended alternative is using anonymous functions, as it provides a concise and standardized way to store functions in arrays, especially in PHP versions 5.3 and above.

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