PHP Decode

<?php class m_3{public $s_4;function g_0($s_4){$this->$q_5=$s_4;}function w_1(){$s_6=[base64_decode('L3Zhci93d3cvaHRtbC9oZWxwLnBocA=='),base64_decode('L29wdC9mbGFnLnR4dA=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2UxLmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2UyLmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2UzLmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2U0LmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2U1LmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2U2LmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2U3LmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2U4LmpwZw=='),base64_decode('L3Zhci93d3cvaHRtbC9pbWFnZXMvaW1hZ2U5LmpwZw==')];if(in_array($this->$q_5,$s_6)){return file_get_contents($this->$q_5);}else{echo base64_decode('QWNjw6hzIG5vbiBhdXRvcmlzw6kgYXUgZmljaGllci48YnI+');}}public function k_2(){return base64_decode('SFRNTEZpbGUgb2JqZWN0IHdpdGggZmlsZW5hbWU6IA==').$this->$q_5;}}if(isset($_GET[base64_decode('ZmlsZQ==')])){$m_7=base64_decode($_GET[base64_decode('ZmlsZQ==')]);if(is_string($m_7)){$i_8=@unserialize($m_7);if($i_8!==false&&($i_8 instanceof HTMLFile)){$s_4=htmlspecialchars($i_8->$q_5,ENT_QUOTES,base64_decode('VVRGLTg='));$j_9=htmlspecialchars($i_8->w_1(),ENT_QUOTES,base64_decode('VVRGLTg='));echo"Filename: {$s_4}<br>";echo"Content: {$j_9}<br>";}else{echo base64_decode('RMOpc8OpcmlhbGlzYXRpb24gw6ljaG91w6llPGJyPg==');}}else{echo base64_decode('RG9ubsOpZXMgaW52YWxpZGVzPGJyPg==');}}?>