How to find out what is written in php script eval(gzinflate(base64_decode)?

Question

PHP

Good day, there is a script

<?php

eval(gzinflate(base64_decode('DZJHDqvIAgCPMzNiQYMJRqNZkDHJYDKbL2IT2ibH0/93gJJKpar2DP0N7/ZXo2yt/s6zpWKo/5VVMZTV339JpaBIm5/xrsRT+JFWkfz9xFxT0ktKzp5+v26ndqa+QxL6ujTOzFU5tVp53Vwq9pOBqdyH/tkffEeaLx/pbORikan2YnS5hQYymsBQyNNeLIz2VN91xNamllPn0YthoyFrTK5GOjdwF1dUBe96asm5ux1E38QAnOgqhPJTMDqd+7myz9QWSRHlf/QrZSKxDH5ZFttcde/2CJLYlMbUguMhkc4Tu53mnJZjrlV2sPX3iHpd65mxzmgn9LUP9zj4D3xQ1SBCJx9Ypt5YhsJcM0L81KXIbOUlj0cWtOn4tOCAyu4QIdcyDnt1zR+VZtKKgjhY4QgUYa27XClP1TIpJtJx/+U54bi+SCKF3rEAuoh04B8ROvtQ4gy/eLDgKTCF6pm69kWXpRkcmMjiZk++E9Favagwhbra499eNTHDZQgdKu9Xwv3K1xoO2PEJItxMoXOlc+I0kQSN07zIpmCxbgnFGOhzE81h8ywuVCekzc0jViczqFMxrLdTqVbltfW6IqONMQ/ybIl56Q+xC8SmgIEo24mImayuHBiufhm0/6FXQxBrINw3aYeT3mXB4THaC9VBV6ld6Ry2GkioYcIifIzhwk5yzZ8rx1hpIblSyaGuabAy0pZCz2dhYfZf4+G5OSOEgjCcRnU5ETUif4/41tpt21DuXkRsHxrzlZU5aT+AV3FZHmHMoxhcyPlfmvZ5y6+W5h5CKo7O90+a9QU8dh+yGVxWxv2WDPnlldV6Y42huYHG1oe556z1AwL2S2y6/JkUql4oxW4BdVVwWsCPQPkReL7Wc5WzVlVzDtgXNvaMnac9ydqxlq5HNAIBX6TPJ55BvX8NKT+zeuUG6ZNuUu83Ls9dC0EHcbmGM76T0ena5J9TYfYx2f1XBFAgCNJ71C+70a9n2aPqiTwTtwqJZRxeL2Jh2tak6hmgdXcH8h90Qe5BNzgGY60WKQ6VWZS8Ik1rZc/AVWEMXMHuS35wHbYEy77DxGPNgiBnc45r2dppiBcsp/LRD8xGXmaz+2vVhOQA5vr72t/AcVCIyLtACvD7SXsDJuZZXay+xPGc/pTUiT3ckk0wUv2qPhXQBtV9EyPiozoAT6Z/T6qytHHJO83qn47nG9tlKwLGvMJUOvr8iAVil3lieh8Mqi+Fb1pIPE8KCM40eO92m8mJlydsAxbECz9qG45FFLeOHpHEiDWVXAfzrmiZsArKMvmzjH2Gt0Vo8oXII4+tC92tWloDUzYXLU/Ou9vYEkzTOL2WaKHYF0i8VnPdo+Ud7HrMoZZMJawtvYXdtyr1uA/3L4TnoJ0P82ZNDQr4ecJzwvG044BDK1TgnGT/CuWCbnLqV3J++sRKW2xGz1HTHzEyyh3SbiJ1GzqgE3PZ8+p+1WJ/t5giZkJujy9ZHd5V3e0zuUUIUvKKrFnVNocZ4HCeXco8ugFTvoPcwUfykkfNKVl7F7PkrSVyKoMNVt5Oi2WbBJKNU7rTbbSv5iRKjNznjGwqNbN2qbOnvAQAIWYJ0PEPWfww/jrE0/mkTYOV0RKlUnJDoOstzehep37eJy2amhHDU6FHPzmW/fehjXwuMF2IuSe+vDTpXXQPGXquJtnWFiH/0VjWp8Rxlr05DK9x/HaO//77659//vn3/w==')));

?>

It is necessary to find out what is written in this script, how can this be done?
I tried to use online decoders for eval(gzinflate(base64_decode), but they either give me exactly the same string, or they write that it is impossible to decode, how can it be? maybe there are some other ways?
I tried to replace eval(gzinflate) with print, it turned out following

)?znR7.]Aq3Sa1WP{/ѯg٣<
e^/ba֤uwtAA78c)Y"MkeUa\K~p˾c͂ gski,F^fkՄqPȻ@
I{&Y]ԉ=ܒM0R>}#:OOq;꟎e+ƼT:bybz/oZH<O

4xvɉ'l?jEĈ5\h
2}Eh#ݭZZS6-OλL8hHVsݣz̡L%-ݷ*/砝fM
ysC+Td
VNeSm$Jl*5v!f	Y0:MRrC-^~'-SG?9|.0]'4]tz&!X֧q9qv

Answer 1

$v9a5cb5d8 = "[email protected]$v0897acf4";
if ($name_name != '') $vd98a07f8 = "$name_name <$v9a5cb5d8>";
else $vd98a07f8 = $v9a5cb5d8;
$vb8ddc93f = "From: $vd98a07f8";
$vb8ddc93f.= "Reply-To: $vd98a07f8";
$v3c87b187 = "X-Priority: 3 (Normal)";
$v3c87b187.= "MIME-Version: 1.0";
$v3c87b187.= "Content-Type: text/html; charset=\"iso-8859-1\"";
$v3c87b187.= "Content-Transfer-Encoding: 8bit";
$v4340fd73 = "Date: " . @date("D, j M Y G:i:s O") . "" . $vb8ddc93f;
$v4340fd73.= "Message-ID: <" . preg_replace('/(.{7})(.{5})(.{2}).*/', '$1-$2-$3', md5(time())) . "@$v0897acf4>";
$v4340fd73.= "To: $v01b6e203";
$v4340fd73.= "Subject: $subject";
$v4340fd73.= $v3c87b187;
$v841a2d68 = $v4340fd73 . "" . $s_body;

This is not all code. More details here - https://toolki.com/en/php-decoder/

Answer 2

Replace eval with print, execute the script, repeat if necessary.
After the next iteration, get the following code:

$v9a5cb5d8 = "[email protected]$v0897acf4"; 
if ($name_name != '') 
  $vd98a07f8 = "$name_name <$v9a5cb5d8>"; 
else 
  $vd98a07f8 = $v9a5cb5d8; 
$vb8ddc93f = "From: $vd98a07f8\r\n"; 
$vb8ddc93f .= "Reply-To: $vd98a07f8\r\n"; 
$v3c87b187 = "X-Priority: 3 (Normal)\r\n"; 
$v3c87b187 .= "MIME-Version: 1.0\r\n"; 
$v3c87b187 .= "Content-Type: text/html; charset=\"iso-8859-1\"\r\n"; 
$v3c87b187 .= "Content-Transfer-Encoding: 8bit\r\n"; 
$v4340fd73 = "Date: " . @date("D, j M Y G:i:s O")."\r\n" . $vb8ddc93f; 
$v4340fd73 .= "Message-ID: <".preg_replace('/(.{7})(.{5})(.{2}).*/', '$1-$2-$3', md5(time()))."@$v0897acf4>\r\n"; 
$v4340fd73 .= "To: $v01b6e203\r\n"; 
$v4340fd73 .= "Subject: $subject\r\n"; 
$v4340fd73 .= $v3c87b187; 
$v841a2d68 = $v4340fd73."\r\n".$s_body;