php中str_pad()函数用法分析

class test{
 private $var;
 public function __construct($var){
 $this->var=$var;
 }
 public function test(){
 $result=str_pad($this->var,30,"*");
 return $result;
 }
}
$T=new test("hello");
$result=$T->test();
echo $result;

hello*************************