从wp_options表中获取选项值

In my wp_options table, there is a field called profile_fields, that field is having the values like as given below

a:18:{
i:1;a:8:{
s:4:"type";s:8:"usermeta";s:4:"icon";s:8:"calendar";s:8:"position";s:1:"9";s:5:"field";s:6:"select";s:4:"name";s:15:"Graduation Year";s:4:"meta";s:15:"graduation_year";s:11:"meta_custom";s:0:"";s:6:"social";s:1:"0";s:8:"can_edit";s:1:"1";s:10:"allow_html";s:1:"0";s:8:"can_hide";s:1:"0";s:7:"private";s:1:"0";s:8:"required";s:1:"1";s:17:"show_to_user_role";s:1:"0";s:17:"edit_by_user_role";s:1:"0";
    s:16:"show_in_register";
    s:1:"1";
    s:9:"help_text";
    s:0:"";
    s:7:"choices";
    s:22:"1991
        1992
        1993
        1994";

 }
}

what I've to do for getting the s22 the field.(1991,1992,1993,1994). I have tried to dump the values using var_dump(), but it only shows some other fields.

anyone please help me.

UPDATED

I've took option value from the database like this

$a = get_option( 'upme_profile_fields' );
        print_r($a);

now it prints like

there it not shows the above given contents(

a:18:{
    i:1;a:8:{
    s:4:"type";s:8:"......

)

Try this :-

$a = get_option( 'profile_fields' );
print_r($a);
// find the value you want to un-serialize, then, put as below

$arr = $a["YOUR VALUE KEY"];

$profile_arr = unserialize($arr);

print_r($profile_arr);