Detailed explanation of how Symfony obtains request parameters in templates and behaviors

<?php echo $sf_request->getParameter(&#39;name&#39;,&#39;namespace&#39;);?>
<?php echo $sf_request->getParameter(&#39;name&#39;);?>

$request->getParameter('name');
//模板中取得参数
<?php echo $sf_params->get(&#39;name&#39;)?>
//带默认值的参数
<?php echo $sf_params->get(&#39;name&#39;,&#39;default&#39;)?>
//在模板中判断一个参数是否存在
<?php if($sf_params->has(&#39;name&#39;)): ?>
<p>Hello,<?php echo $sf_params->get(&#39;name&#39;)?>!</p>
<?php else: ?>
<p>Hello,JohnDoe!</p>
<?php endif; ?>
//包含所有参数的数组
$request->getParameterHolder()->getAll()
//完整的URI路径
//&#39;http://localhost/myapp_dev.php/mymodule/myaction&#39;
getUri()
//&#39;/mymodule/myaction&#39;
getPathInfo()
//在action中
$hasFoo =$this->getRequest()->hasParameter(&#39;foo&#39;);
$hasFoo = $this->hasRequestParameter(&#39;foo&#39;);//Shorter version
$foo  =$this->getRequest()->getParameter(&#39;foo&#39;);
$foo  =$this->getRequestParameter(&#39;foo&#39;); //Shorterversion