php 获取图片后缀名的简单类

<?php
//获取图片的后缀名
class Suffix{ 
  public $str; 
  public function __construct($string){ 
      $this->str = $string; 
  } 
  public function getSuffix(){ 
      $pos = strpos($this->str,'.',1); 
      $suffix = substr($this->str,$pos+1); 
      return $suffix; 
   } 
} 

$str = new Suffix('45.17226c-jw1d.r52jjo4ppj.jpg'); 
echo $str->getSuffix(); //result:jpg
//by http://www.jb200.com
?>