PHP相关文件操作函数和jquery.Form文件上传

1.unlink() 函数删除文件

$file = "test.txt";
if (!unlink($file))
  {
  echo ("Error deleting $file");
  }
else
  {
  echo ("Deleted $file");
  }
?>

2.strstr

$str = 'sdfdsfds.jpg';
echo strstr($str,'.');  //.jpg
echo strstr($str,'.',true);  //sdfdsfds