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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
class WidgetFactory
{
}
// объявляем наследника
class WidgetFactory_Child extends WidgetFactory
{
}
$WF = new WidgetFactory();
$WFC = new WidgetFactory_Child();
if (is_subclass_of($WFC, 'WidgetFactory')) {
echo "да, \$WFC наследует WidgetFactory\n";
} else {
echo "нет, \$WFC не наследует WidgetFactory\n";
}