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Can you store a function in a PHP array?

stackoverflow.com › questions › 1499862 › can-you-store-a-function-in-a-php-array

The recommended way to do this is with an anonymous function:

$functions = [
  'function1' => function ($echo) {
        echo $echo;
   }
];

If you want to store a function that has already been declared then you can simply refer to it by name as a string:

function do_echo($echo) {
    echo $echo;
}

$functions = [
  'function1' => 'do_echo'
];

In ancient versions of PHP (<5.3) anonymous functions are not supported and you may need to resort to using create_function (deprecated since PHP 7.2):

$functions = array(
  'function1' => create_function('$echo', 'echo $echo;')
);

All of these methods are listed in the documentation under the callable pseudo-type.

Whichever you choose, the function can either be called directly (PHP ≥5.4) or with call_user_func/call_user_func_array:

$functions'function1';

call_user_func($functions['function1'], 'Hello world!');

Answer from Alex Barrett on Stack Overflow

PHP

php.net › manual › en › function.in-array.php

PHP: in_array - Manual

Here is a recursive in_array function: <?php $myNumbers = [ [1,2,3,4,5], [6,7,8,9,10], ]; $array = [ 'numbers' => $myNumbers ]; // Let's try to find number 7 within $array $hasNumber = in_array(7, $array, true); // bool(false) $hasNumber = in_array_recursive(7, $array, true); // bool(true) function in_array_recursive(mixed $needle, array $haystack, bool $strict): bool { foreach ($haystack as $element) { if ($element === $needle) { return true; } $isFound = false; if (is_array($element)) { $isFound = in_array_recursive($needle, $element, $strict); } if ($isFound === true) { return true; } } return false; }

W3Schools

w3schools.com › php › php_ref_array.asp

PHP Array Functions

The array functions are part of the PHP core. There is no installation needed to use these functions.

Discussions

Can you store a function in a PHP array? - Stack Overflow

All of these methods are listed in the documentation under the callable pseudo-type. Whichever you choose, the function can either be called directly (PHP ≥5.4) or with call_user_func/call_user_func_array: More on stackoverflow.com

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