php脚本只允许调用一个带有参数的函数

我已经编写了一个php类，其中包含2个函数，但当我在不同的脚本中调用函数时，它只允许运行2个函数中的1个。

这是带有函数的脚本。

<?php
 define('RDFAPI_INCLUDE_DIR', 'rdfapi-php/api/');
 require_once('SimpleRdfParser.php');


 class retrieve{
 public $p;
 public $uri;
 public $rdf;
 function retrieve(){ 
   $this->p = new SimpleRdfParser();
   $this->uri = 'rdfs/crime.owl';
   $this->rdf = @file($this->uri);
}
function getName(){
 return "heyyy";
}
public function getL1Comment($type){
  /*
    this function gets the comments that are to do with the main type of crime i.e.       Sexual Offences
*/ 
if (is_array($this->rdf)) {
  $this->rdf = join('',  $this->rdf);
  if (is_array($data = $this->p->string2triples($this->rdf, $this->uri))) {
     $val = $data["http://localhost/".$type][2][1][0];
     return $val;
     exit;     
  }
 }
}
public function getChildComment($crime){
/*
  this function gets the comments from the child node of the main type of crime i.e. Rape of a Female aged 16 and over, 
  this is a child node of Sexual Offences
*/
if (is_array($this->rdf)) {
$this->rdf = join('',  $this->rdf);
if (is_array($data = $this->p->string2triples($this->rdf, $this->uri))) {
    $val = $data["http://localhost/".$crime][2][1][0];
    return $val;
    exit;     
   }
  }
 }


}

这就是调用它的脚本：

<?php
 require('retrieve.php');
 $type = $_POST["type"];
 $crime = $_POST["crime"];
 $q = new retrieve();
echo $q->getL1Comment($type)."<br />";
//print($q->getL1Comment($type)."<br />");
print($q->getName());
//print($q->getName());
echo $q->getChildComment($crime);

?>

有人知道为什么会发生这种事吗？

提前感谢