i just bought this book for php 4 and it tells you how to make databases using the dba functions. so i tried to use dba_open() and i got an error back saying that the funstion is undefind. my server is running apache on a Unix server with php version 4.3.1 what have i done wrong?

dba_open( "./directory", "n" , "gdbm");

thats how the book told me to do it as. ive checked it out on php.net to see if the function exisits. and it does, so why doesnt it work? is it my version of PHP? is it that the dba_function is turned off?

    this is what i put in

    $handle = dba_open( "./directory", "n", "dbm") or die("cant open");
    dba_insert("stuff" , "things", $handle);
    dba_close($handle);

    and i still got this back

    Fatal error: Call to undefined function: dba_open() in /home/comesept/public_html/introverted/crdata.php on line 8

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