Zephir\Optimizers\FunctionCall\UniquePathKeyOptimizer::optimize PHP Method

    public function optimize(array $expression, Call $call, CompilationContext $context)
    {
        if (!isset($expression['parameters'])) {
            return false;
        }
        if (count($expression['parameters']) != 1) {
            throw new CompilerException("'unique_path_key' only accepts one parameter", $expression);
        }
        /**
         * Process the expected symbol to be returned
         */
        $call->processExpectedReturn($context);
        $symbolVariable = $call->getSymbolVariable(true, $context);
        if ($symbolVariable->isNotVariableAndString()) {
            throw new CompilerException("Returned values by functions can only be assigned to variant variables", $expression);
        }
        if ($call->mustInitSymbolVariable()) {
            $symbolVariable->initVariant($context);
        }
        $context->headersManager->add('kernel/file');
        $resolvedParams = $call->getReadOnlyResolvedParams($expression['parameters'], $context, $expression);
        $symbol = $context->backend->getVariableCode($symbolVariable);
        $context->codePrinter->output('zephir_unique_path_key(' . $symbol . ', ' . $resolvedParams[0] . ' TSRMLS_CC);');
        return new CompiledExpression('variable', $symbolVariable->getRealName(), $expression);
    }