PHP更新CSS

I need to update the css according to section_name. If section is Featured css would be right:0 and if section_name is Latest the css would be left:0 How can I inject a piece of php into css ?

<img src="square-009.jpg" style="width:300px; height:355px; position: fixed; z-index:9; right:0;" />

The section_name variable is already defined and it is working as

<?php echo $section['section_name']; ?>

Just use classes:

.Featured {
  width:300px;
  height:355px;
  position:fixed;
  z-index:9;
  right:0;
}

.Latest {
  width:300px;
  height:355px;
  position:fixed;
  z-index:9;
  left:0;
}

And then just populate the class dynamically:

<img src="square-009.jpg" class="<?php echo $section['section_name']; ?>" />