<?php

/**
 * @property string|null $someProp
 */
final class Entity
{
    protected array $_fields = [];

    public function &__get(string $field): mixed
    {
        $value = null;
        if (array_key_exists($field, $this->_fields)) {
            $value = &$this->_fields[$field];
        }

        return $value;
    }
}

$entity = new Entity();
if ($entity->someProp) {
	preg_replace('/\r\n|\n|\r/', '', $entity->someProp);
}