Pimcore\Model\Object\Fieldcollection\Definition::delete PHP Method

    public function delete()
    {
        @unlink($this->getDefinitionFile());
        @unlink($this->getPhpClassFile());
        // update classes
        $classList = new Object\ClassDefinition\Listing();
        $classes = $classList->load();
        if (is_array($classes)) {
            foreach ($classes as $class) {
                foreach ($class->getFieldDefinitions() as $fieldDef) {
                    if ($fieldDef instanceof Object\ClassDefinition\Data\Fieldcollections) {
                        if (in_array($this->getKey(), $fieldDef->getAllowedTypes())) {
                            $this->getDao()->delete($class);
                            break;
                        }
                    }
                }
            }
        }
    }