PHP

Example for Debian:

Enable sury/php repository

apt-get install php8.1-{cgi,cli,fpm,pdo,gd,mbstring,mysqlnd,opcache,curl,xml,zip}

Install additional PHP packages

apt-get install php8.1-{cgi,cli,fpm,pdo,gd,mbstring,mysqlnd,opcache,curl,xml,zip}

PHP Class using StringTranslationTrait

StringTranslationTrait allow to get t() and formatPlural() methods
Example:
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\StringTranslation\TranslationInterface;
class MyClass {


This is usefull if you want to do some actions just one time.

The drush comman is php-script alias src

On drupal 8 with drush

Example :
drush --uri=drupal.loc scr /modules/custom/mymodule/scripts/test-script.php

Example :

$stopwords = ['toto', 'Pied', 'the'];
$str = 'bla bla toto bla bla Toto bla bla Tôtô bla bla totô bla bla bla bla the thé pied pïed pîéd';

Example of a pager (pagination) on php:

function showpager($currentIndex = 0, $buttons = 5, $totalPages = 50) {
  $currentPage = $lowerLimit = $upperLimit = min($currentIndex, $totalPages);
  //Search boundaries


Generate a random key.

$random_key = str_shuffle('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'); // 62 characters
$random_key = substr($random_key, 0, 10); // 10 characters

The structure of the examples are like:
namespace Drupal\mymodule\Tools;
class MyTools extends MyToolsBase {
...
}
...
class MyToolsBase {
  public function showClass() {
    $class_name = ....
    echo $class_name;
  }


Different between self:: and static (Late Static Bindings)

Static references to the current class like self:: or __CLASS__ are resolved using the class in which the function belongs, as in where it was defined.

Method 1. (Classical way)

Use a captcha system like Math captcha, Image captcha, reCaptcha of google....

An email is classified as spam or not spam on the receiving end, not the sending end. But you can improve