ParsedExpression example

asort($names);
        $cacheKeyItems = [];

        foreach ($names as $nameKey => $name) {
            $cacheKeyItems[] = \is_int($nameKey) ? $name : $nameKey.':'.$name;
        }

        $cacheItem = $this->cache->getItem(rawurlencode($expression.'//'.implode('|', $cacheKeyItems)));

        if (null === $parsedExpression = $cacheItem->get()) {
            $nodes = $this->getParser()->parse($this->getLexer()->tokenize((string) $expression), $names);
            $parsedExpression = new ParsedExpression((string) $expression, $nodes);

            $cacheItem->set($parsedExpression);
            $this->cache->save($cacheItem);
        }

        return $parsedExpression;
    }

    /** * Validates the syntax of an expression. * * @param array|null $names The list of acceptable variable names in the expression, or null to accept any names * * @throws SyntaxError When the passed expression is invalid */

namespace Symfony\Component\ExpressionLanguage\Tests;

use PHPUnit\Framework\TestCase;
use Symfony\Component\ExpressionLanguage\Node\ConstantNode;
use Symfony\Component\ExpressionLanguage\ParsedExpression;

class ParsedExpressionTest extends TestCase
{
    public function testSerialization()
    {
        $expression = new ParsedExpression('25', new ConstantNode('25'));

        $serializedExpression = serialize($expression);
        $unserializedExpression = unserialize($serializedExpression);

        $this->assertEquals($expression, $unserializedExpression);
    }
}