ลองหัดเขียน PHP OOP วันแรก เพียงแค่ 2 บรรทัดแรกก็ syntax error แล้ว ช่วยทีค่ะ

<?php
define('x','ddd');
class c
{
	public $v1,$v2,$v3;
	public $v4 = x;
	function __construct(){
		$this->v1 = @$_REQUEST['id'];
		$this->v2 = @$_REQUEST['page'];	
		$this->v3 = @$_REQUEST['cat'];
	}
}

$c = new c;
echo $c->v1.','.$c->v2.','.$c->v3.','.$c->v4;

?>

<?PHP
class report {
	 
	public $group_id,$group_sid;

	function __construct(){
		$this->$group_id  = @$_REQUEST['gid'];
		$this->$group_sid = @$_REQUEST['gsid'];	
	}

	
	public function get_report_url($group_id){
		if($group_id==1){
			$order_by='numberID';
		  }else{
			$order_by='group_sub_id';
		  }
		
	    $sql = "select * from tb_group_subs where group_sub_status ='1' and group_id='" .$group_id . "' order by ".$order_by." asc ";   
		
		$q= mysql_query($sql);
		while ($r= mysql_fetch_array($q)){
		list($gsid, $gid ,$gsname ,$gs_status ,$g_sub_date)=$r;
		echo "$gsname";
		}
		
		
	}
}

?>

<?PHP
$report= new report();
//$group_id=1;
$report->get_report_url($group_id);
?>