PHP，SELECT在插入相同脚本后不返回值

Question

Here is an easy one, but can't figure out why is not working. Need another set of eyes. 3 queries. 1 insert, 1 select, then 1 insert again. My select query is supposed to grab a value from the data recently inserted, and then store that value in a variable, then run the second insert for another table. Well, everything works, except the select. I even tryied to add a mysql_query("COMMIT",$conn) and still nothing. Any help is very appreciated. Thanks!!!

$customerQ = "INSERT INTO
customerData(fname, mname, lname, email, homePhone, cellphone, address, 
city, county, state, zip, gascompany, eleccompany, addedBy)
VALUES('$fname', '$mname', '$lname', '$emailCustomer', '$hphone', '$cellphone',
  '$address', '$city', '$county', '$state', '$zip', '$gas', '$electric', 
  '$userName'
) ";             
//General WO# calculation
$calcWO = "SELECT 
              auditRequest.workOrderNum
            FROM
              auditRequest
            ORDER BY
               auditRequest.workOrderNum DESC
            LIMIT 1
        ";  

//General Customer number calculation. For the Work Order Insert
$calc = "SELECT
              customerData.custnumber
           FROM
              customerData
           WHERE
              fname = '$fname' and
              mname = '$mname' and
              lname = '$lname'
           ORDER BY
           customerData.custnumber DESC
           LIMIT 1
     "; 

    //Customer Information Insert (from Insert Query)
    $resultCustQ = mysql_query($customerQ, $connection);
    mysql_query("COMMIT", $connection); //make sure to commit to be able to query new records
    // Test the query
    if(!$resultCustQ) die ("error 1". mysql_error());

    //Customer Information Insert (from Insert Query)
    $resultCustQ = mysql_query($customerQ, $connection);
    mysql_query("COMMIT", $connection); //make sure to commit to be able to query new records
    // Test the query
    if(!$resultCustQ) die ("error 1". mysql_error());

    //Calculate new customer number
    $calc_result = mysql_query($calc, $connection);
    // Test the query
    if(!$calc_result) die ("error 1". mysql_error());
    $row=mysql_fetch_array($calc_result);
    $custnum = $row['custnumber']; // This is the new Customer.

    //Work Order Information (run SQL Insert)
    $resultWOQ = mysql_query($workOrderQ, $connection);
// Test the query
    if(!$resultWOQ) die ("error 1". mysql_error());

Answer 1

I would avoid the crutch of INSERT followed by SELECT to find the inserted record altogether and use MySQL's ability to return the ID of the most recently inserted row (provided your table as an AUTO INCREMENT primary key) via PHP's mysql_insert_id, also available through PDO via lastInsertId.