Composer/PSR - How to autoload functions?

Question

How can I autoload helper functions (outside of any class)? Can I specify in composer.json some kind of bootstrap file that should be loaded first?

Answer 1

After some tests, I have came to the conclusions that adding a namespace to a file that contains functions, and setting up composer to autoload this file seems to not load this function across all the files that require the autoload path.

To synthesize, this will autoload your function everywhere:

composer.json

"autoload": {
    "files": [
        "src/greetings.php"
    ]
}

src/greetings.php

...

But this will not load your function in every require of autoload:

composer.json

"autoload": {
    "files": [
        "src/greetings.php"
    ]
}

src/greetings.php

And you would call your function using use function ...; like following:

example/example-1.php