php.lab/examples/code/functions/function_as_variable.php at main · katheroine/php.lab · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
<?php

/*
 * Copyright (C) 2024-2026 Katarzyna Krasińska
 * PHP.lab - https://github.com/katheroine/php.lab
 * Licensed under GPL-3.0 - see LICENSE.md
 */

function someFunction(int $someArgument): int
{
    $result = $someArgument * 2;

    return $result;
}

$someFunctionVariable1 = 'someFunction';
$result = $someFunctionVariable1(3);
print("Some function result: {$result}\n");

$someFunctionVariable2 = someFunction(...);
$result = $someFunctionVariable2(3);
print("Some function result: {$result}\n");

$someFunctionVariable3 = 'someFunction'(...);
$result = $someFunctionVariable2(3);
print("Some function result: {$result}\n");

$someFunctionVariable4 = Closure::fromCallable('someFunction');
$result = $someFunctionVariable4(3);
print("Some function result: {$result}\n");

$otherFunctionVariable1 = function (int $someArgument): int
{
    $result = $someArgument * 3;

    return $result;
};

$result = $otherFunctionVariable1(3);
print("Other function result: {$result}\n");

$otherFunctionVariable2 = Closure::fromCallable($otherFunctionVariable1);
$result = $otherFunctionVariable2(3);
print("Other function result: {$result}\n");