📚 Cheatsheet

composer require guzzlehttp/guzzle

file_put_contents('mon_fichier.txt', 'Nouveau contenu');

{
    "require": {
        "monolog/monolog": "2.0.*"
    },
    "autoload": {
        "psr-4": {"App\\": "src/"}
    }
}

composer install

$contenu = file_get_contents('mon_fichier.txt');

$fichiers = scandir('./mon_dossier');

if (file_exists('mon_fichier.txt')) {
    // ...
}