array_splice()

Hi evey1, sorry if I' ve already posted this : in order to remove a whole array of values from a multidimensional array I tried the following:

foreach($bkmks as $val) {                                                                                     if($val[8]==$cod){
                                          array_splice($bkmks,$val,1);
                                                      }
                                     }    It works fine for all the arrays but the first ($bkmks[0])....

When I try to remove that array this is what I get : Fatal error: Maximum execution time of 30 seconds exceeded in ..... .... after that if I read $bkmks all the arrays have been removed but $bkmks[0] (the array I wanted to remove) Why ? Is there a better way to do it ? thanks again