hook.php

<?php

function plugin_skeleton_install() {
   set_time_limit(900);
   ini_set('memory_limit', '2048M');

   $classesToInstall = [
      'PluginSkeletonConfig',
      'PluginSkeletonProfile',
   ];

   echo "<center>";
   echo "<table class='tab_cadre_fixe'>";
   echo "<tr><th>".__("MySQL tables installation", "skeleton")."<th></tr>";

   echo "<tr class='tab_bg_1'>";
   echo "<td align='center'>";

   //load all classes
   $dir  = Plugin::getPhpDir('skeleton') . "/inc/";
   foreach ($classesToInstall as $class) {
      if ($plug = isPluginItemType($class)) {
         $item = strtolower($plug['class']);
         if (file_exists("$dir$item.class.php")) {
            include_once ("$dir$item.class.php");
         }
      }
   }

   //install
   foreach ($classesToInstall as $class) {
      if ($plug = isPluginItemType($class)) {
         $item =strtolower($plug['class']);
         if (file_exists("$dir$item.class.php")) {
            if (!call_user_func([$class,'install'])) {
               return false;
            }
         }
      }
   }

   echo "</td>";
   echo "</tr>";
   echo "</table></center>";

   return true;
}

function plugin_skeleton_uninstall() {
   echo "<center>";
   echo "<table class='tab_cadre_fixe'>";
   echo "<tr><th>".__("MySQL tables uninstallation", "fields")."<th></tr>";

   echo "<tr class='tab_bg_1'>";
   echo "<td align='center'>";

   $classesToUninstall = [
      'PluginSkeletonConfig',
      'PluginSkeletonProfile',
   ];

   foreach ($classesToUninstall as $class) {
      if ($plug = isPluginItemType($class)) {

         $dir  = Plugin::getPhpDir('skeleton') . "/inc/";
         $item = strtolower($plug['class']);

         if (file_exists("$dir$item.class.php")) {
            include_once ("$dir$item.class.php");
            if (!call_user_func([$class,'uninstall'])) {
               return false;
            }
         }
      }
   }

   echo "</td>";
   echo "</tr>";
   echo "</table></center>";

   return true;
}