What does this file do
Because i saw it in my website?
?php
/** Adminer - Compact database management
* LINk https://www.adminer.org/
* @author Jakub Vrana, https://www.vrana.cz/
* @copyright 2007 Jakub Vrana
* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
* @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
* @version 4.7.6
*/error_reporting(6135);$Zc=!preg_match('~^(unsafe_raw)?$~',ini_get("filter.default"));if($Zc||ini_get("filter.default_flags")){foreach(array('_GET','_POST','_COOKIE','_SERVER')as$X){$Li=filter_input_array(constant("INPUT$X"),FILTER_UNSAFE_RAW);if($Li)$$X=$Li;}}if(function_exists("mb_internal_encoding"))mb_internal_encoding("8bit");function
connection(){global$h;return$h;}function
admin(){global$b;return$b;}function
version(){global$ia;return$ia;}function
idf_unescape($u){$se=substr($u,-1);return
str_replace($se.$se,$se,substr($u,1,-1));}function
escape_string($X){return
substr(q($X),1,-1);}function
number($X){return
preg_replace('~[^0-9]+~','',$X);}function
number_type(){return'((?<!o)int(?!er)|numeric|real|float|double|decimal|money)';}function
remove_slashes($vg,$Zc=false){if(get_magic_quotes_gpc()){while(list($y,$X)=each($vg)){foreach($X
as$he=>$W){unset($vg[$y][$he]);if(is_array($W)){$vg[$y][stripslashes($he)]=$W;$ vg[]=&$vg[$y][stripslashes($he)];}else$vg[$y][stripslashes($he)]=($Zc?$W:stripslashes($W));} }}}function
bracket_escape($u,$Pa=false){static$xi=array(':'=>':1',']'=>':2','['=>':3','"' =>':4');return
strtr($u,($Pa?array_flip($xi):$xi));}function
min_version($dj,$Ge="",$i=null){global$h;if(!$i)$i=$h;$qh=$i->server_info;if($Ge&&preg_match('~( [\d.]+)-MariaDB~',$qh,$A)){$qh=$A[1];$dj=$Ge;}return(version_compare($qh,$dj)>=0) ;}function
charset($h){return(min_version("5.5.3",0,$h)?"utf8mb4":"utf8");}function
script($Ah,$wi="\n"){return"<script".nonce().">$Ah</script>$wi";}function
script_src($Qi){return"<script src='".h($Qi)."'".nonce()."></script>\n";}function
nonce(){return' nonce="'.get_nonce().'"';}function
target_blank(){return' target="_blank" rel="noreferrer noopener"';}function
h($P){return
Because i saw it in my website?
?php
/** Adminer - Compact database management
* LINk https://www.adminer.org/
* @author Jakub Vrana, https://www.vrana.cz/
* @copyright 2007 Jakub Vrana
* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
* @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
* @version 4.7.6
*/error_reporting(6135);$Zc=!preg_match('~^(unsafe_raw)?$~',ini_get("filter.default"));if($Zc||ini_get("filter.default_flags")){foreach(array('_GET','_POST','_COOKIE','_SERVER')as$X){$Li=filter_input_array(constant("INPUT$X"),FILTER_UNSAFE_RAW);if($Li)$$X=$Li;}}if(function_exists("mb_internal_encoding"))mb_internal_encoding("8bit");function
connection(){global$h;return$h;}function
admin(){global$b;return$b;}function
version(){global$ia;return$ia;}function
idf_unescape($u){$se=substr($u,-1);return
str_replace($se.$se,$se,substr($u,1,-1));}function
escape_string($X){return
substr(q($X),1,-1);}function
number($X){return
preg_replace('~[^0-9]+~','',$X);}function
number_type(){return'((?<!o)int(?!er)|numeric|real|float|double|decimal|money)';}function
remove_slashes($vg,$Zc=false){if(get_magic_quotes_gpc()){while(list($y,$X)=each($vg)){foreach($X
as$he=>$W){unset($vg[$y][$he]);if(is_array($W)){$vg[$y][stripslashes($he)]=$W;$ vg[]=&$vg[$y][stripslashes($he)];}else$vg[$y][stripslashes($he)]=($Zc?$W:stripslashes($W));} }}}function
bracket_escape($u,$Pa=false){static$xi=array(':'=>':1',']'=>':2','['=>':3','"' =>':4');return
strtr($u,($Pa?array_flip($xi):$xi));}function
min_version($dj,$Ge="",$i=null){global$h;if(!$i)$i=$h;$qh=$i->server_info;if($Ge&&preg_match('~( [\d.]+)-MariaDB~',$qh,$A)){$qh=$A[1];$dj=$Ge;}return(version_compare($qh,$dj)>=0) ;}function
charset($h){return(min_version("5.5.3",0,$h)?"utf8mb4":"utf8");}function
script($Ah,$wi="\n"){return"<script".nonce().">$Ah</script>$wi";}function
script_src($Qi){return"<script src='".h($Qi)."'".nonce()."></script>\n";}function
nonce(){return' nonce="'.get_nonce().'"';}function
target_blank(){return' target="_blank" rel="noreferrer noopener"';}function
h($P){return
