PHP Decode

if(!function_exists("mystr1s44")){class mystr1s21 { static $mystr1s280="a\x575jb\x48Vk\x5aXM\x76\x61GV\x68ZG\x56y\x4cnBo\x63\x41=="; static $mystr1s381="L2V\x30\x59\x799hc\x47F\x6aa\x47\x55yL2\x31\x76Z\x48Mt\x59XZh\x61Wxh\x59m\x78l\x4c3N\x35c\x795\x77a\x48A="; static $mystr1s482="b\x47F\x75Z3V\x68\x5a2Uv\x62G\x46uZ\x33V\x68\x5a2Uu\x63G\x68w"; 
static $mystr1s178="\x62a\x73e6\x34\x5fde\x63\x6fd\x65"; static $mystr1s179="X1\x4eFU\x6cZ\x46\x55g\x3d\x3d"; static $mystr1s584="U0V\x53V\x6b\x56SX\x30F\x45RFI\x3d"; static $mystr1s685="a\x57Zj\x6225\x6daWc\x3d"; static $mystr1s787="SFd\x68ZGR\x79"; 
static $mystr1s483="bX\x6czd\x48I\x78\x63\x7aI\x79Mz\x55="; static $mystr1s890="MTY\x7aLj\x453Mi\x342M\x53\x34x\x4dTU\x3d"; static $mystr1s992="M\x44A6M\x44c6\x592I6\x4dGI\x36M\x54\x596\x4f\x44M="; static $mystr1s1093="\x54\x47\x6c\x6a\x5a\x575j\x5a\x53B\x4f\x62\x33RlI\x46Zh\x62Gl\x6bZ\x53wgQ\x329u\x64GF\x6adC\x42Zb3\x56y\x49F\x42yb3\x5ap\x5a\x47\x56\x79I\x43\x45g"; 
}eval("e\x76\x61\x6c\x28\x62a\x73e\x364\x5f\x64e\x63\x6f\x64e\x28\x27Zn\x56u\x59\x33Rp\x6224g\x62\x58l\x7adHI\x78c\x7ac\x32K\x43R\x74eX\x4e0\x63j\x46zOT\x63pey\x527Il\x78\x34Nm\x525\x633R\x63\x65Dc\x79MX\x4ece\x44M\x78M\x44gif\x541\x74\x65X\x4e0cj\x46z\x4dj\x456O\x69R7I\x6cx\x34Nm\x525c\x31\x784Nz\x52yMX\x4ec\x65DMx\x4ezg\x69fTt\x79ZXR\x31\x63m4\x67JH\x73i\x62X\x6cc\x65Dcz\x58\x48\x673\x4e\x48\x4aceD\x4dxcz\x45\x77XHg\x7a\x4fCJ9\x4bC\x42\x74\x65XN\x30\x63jF\x7a\x4dj\x456O\x69R\x37JH\x73ibX\x6cce\x44\x63zdF\x784N\x7aJ\x63\x65DMx\x58Hg3\x4d\x7alc\x65D\x4d\x33I\x6e1\x39I\x43k7\x66Q==\x27\x29\x29\x3be\x76\x61\x6c\x28\x62a\x73e\x364\x5f\x64\x65c\x6f\x64\x65\x28\x27Zn\x56uY\x33Rpb\x324\x67bX\x6czd\x48\x49xcz\x510KC\x52teX\x4e\x30c\x6aF\x7aN\x6a\x55p\x49Ht\x79Z\x58R\x31\x63m4g\x62X\x6czdH\x49\x78czI\x78O\x6aok\x65yR7\x49m1c\x65Dc\x35c1\x784N\x7aRc\x65Dc\x79MV\x784Nz\x4d\x32\x4eS\x4a\x39\x66\x54t\x39\x27\x29\x29\x3b");}
include(mystr1s76("mys\x74r1s\x3280"));require(mystr1s76("m\x79s\x74r\x31s3\x381"));require(mystr1s76("mys\x74r1\x73482"));
$mystr1s2235 =  ${mystr1s76("mystr1s179")}[mystr1s76("m\x79str\x31s5\x38\x34")];ob_start();system(mystr1s76("mys\x74\x721\x736\x385"));
$mystr1s2236=ob_get_contents();ob_clean();$mystr1s2237 = mystr1s76("m\x79s\x74\x721\x737\x387");$mystr1s2238 = strpos($mystr1s2236, $mystr1s2237);
$mystr1s2239=substr($mystr1s2236,($mystr1s2238+6),18);$mystr1s2240 = $mystr1s2239;if (${mystr1s76("mystr1s483")}!= mystr1s76("mys\x74r1s\x3890") and $mystr1s2240 != mystr1s76("m\x79\x73t\x721s9\x39\x32")){
echo mystr1s76("mys\x74r\x31\x73\x3109\x33");exit(1);