To view the terms under which this email is distributed, please go to http://disclaimer.leedsmet.ac.uk/email.htm On 03 November 2004 16:39, Matthew Weier O'Phinney wrote: > * Daniel Schierbeck <dasch@xxxxxxxxxx>: > > Giles Roadnight wrote: > > > If I defined a function with 4 parameters but only pass 3 I get an > > > error. Is there anyway around this? > > > > > > I want to be able to set the missing parameter to a default value > > > if it is not passed which works ok but How do I get rid of the > > > error message? > > > > If you want an argument to be optional and still be able to check > > whether or not it's been set, you can use NULL as the default value: > > > > function foobar ($a, $b, $c = null) > > { > > if (isset($c)) { > > echo 'The third argument was set'; > > } > > } > > That check should be for 'is_null($c)' as the default value of $c will > be null, and it will be always set, even if not sent. Nope. At least not necessarily. isset(NULL) returns true, so the test as originally written is valid. However, it may be that you want to handle the no-value-supplied case first, in which case: if (is_null($c)): /// handle default case else: ... endif; might be slightly more legible than if (!isset($c)): etc. Cheers! Mike --------------------------------------------------------------------- Mike Ford, Electronic Information Services Adviser, Learning Support Services, Learning & Information Services, JG125, James Graham Building, Leeds Metropolitan University, Headingley Campus, LEEDS, LS6 3QS, United Kingdom Email: m.ford@xxxxxxxxxxxxxx Tel: +44 113 283 2600 extn 4730 Fax: +44 113 283 3211 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
