Using array_multisort - php

Question

I'm using array_multisort at the beginning of a script after querying the database. Works fine. The arrays are sorted.
Later on in the same script, I use array_multisort again after another query to the database. The arrays are the same length for this second call but a different length than the arrays used initially.
I'm getting the "array_multisort array sizes are inconsistent" warning in my error_log. Are the arrays persisting from one call to the next and therefore, causing this error? If so, is there a way to clean up the function and remove the initial arrays used before the second call?
Here's a summarized view of the code with var_dump output included:
...1st query...
...1st array_multisort use based on the query...
array_multisort($shiftdate, $beg24, $uniquename, $subunit, $unit, $dept, $shiftdetail, $scheduledStaff);
...1st var_dump values based on array_multisort...
array(3) {
[0]=>
array(10) {
["uniquename"]=>
string(3) "Bob"
["shiftdate"]=>
string(10) "2012-08-12"
["subunit"]=>
string(1) "1"
["unit"]=>
string(1) "1"
["dept"]=>
string(1) "1"
["shiftdetail"]=>
string(5) "7a-3p"
["firstname"]=>
string(0) ""
["lastname"]=>
string(0) ""
["email"]=>
string(0) ""
["beg24"]=>
string(4) "7.00"
}
[1]=>
array(10) {
["uniquename"]=>
string(4) "Cara"
["shiftdate"]=>
string(10) "2012-08-12"
["subunit"]=>
string(1) "1"
["unit"]=>
string(1) "1"
["dept"]=>
string(1) "1"
["shiftdetail"]=>
string(5) "7a-3p"
["firstname"]=>
string(0) ""
["lastname"]=>
string(0) ""
["email"]=>
string(0) ""
["beg24"]=>
string(4) "7.00"
}
[2]=>
array(10) {
["uniquename"]=>
string(4) "Ryan"
["shiftdate"]=>
string(10) "2012-08-12"
["subunit"]=>
string(1) "1"
["unit"]=>
string(1) "1"
["dept"]=>
string(1) "1"
["shiftdetail"]=>
string(5) "7a-3p"
["firstname"]=>
string(0) ""
["lastname"]=>
string(0) ""
["email"]=>
string(0) ""
["beg24"]=>
string(4) "7.00"
}
}
...2nd query...
...2nd array_multisort use based on the query...
array_multisort($shiftdate, $beg24, $uniquename, $subunit, $unit, $dept, $shiftdetail, $firstname, $lastname, $email, $scheduledStaffAndThoseWithDetail);
...NOTE: error_log warning occurs at this second array_multisort use...PHP Warning: array_multisort() [<a href='function.array-multisort'>function.array-multisort</a>]: Array sizes are inconsistent...
...2nd var_dump values based on array_multisort...
array(2) {
[0]=>
array(10) {
["uniquename"]=>
string(4) "Ryan"
["shiftdate"]=>
string(10) "2012-08-12"
["subunit"]=>
string(1) "1"
["unit"]=>
string(1) "1"
["dept"]=>
string(1) "1"
["shiftdetail"]=>
string(5) "7a-3p"
["firstname"]=>
string(4) "Ryan"
["lastname"]=>
string(5) "Dobbs"
["email"]=>
string(17) "dobbsr#gmail.com"
["beg24"]=>
string(4) "7.00"
}
[1]=>
array(10) {
["uniquename"]=>
string(4) "Cara"
["shiftdate"]=>
string(10) "2012-08-12"
["subunit"]=>
string(1) "1"
["unit"]=>
string(1) "1"
["dept"]=>
string(1) "1"
["shiftdetail"]=>
string(5) "7a-3p"
["firstname"]=>
string(4) "Cara"
["lastname"]=>
string(6) "Smith"
["email"]=>
string(14) "cara#gmail.com"
["beg24"]=>
string(4) "7.00"
}
}