unable to drop database mysql through php mysql_query -

i unable drop mysql database through php mysql_query while being done manually in phpmyadmin.

 <?php  $dbname = "mango";  $mysqlquery = "drop database ".$dbname;   echo " ".$mysqlquery ;   if(mysql_query($mysqlquery))  {     echo " dropped  table".$dbname;      }      else{          echo " unable drop";      }  ?> 

for reference