Re: Re: Has element of array been initialized?

"Ben Edwards" <ben@videonetwork.org> wrote in message news:5.1.1.6.2.20030409002444.03435ff8@mail.videonetwork.org... > Guess I need to give a bit more context. > > The code below is used to update the database. It is run when a form with > multiple records is submitted. The array $product_code contains the codes > of the products and $seq the order they are to be displayed. > > for Example:- > > $product_code[1] = "ER", $seq[1] = 10 > $product_code[2] = "TY", $seq[1] = Unititialised > > > Problem is if the user blanks out the $seq field the element of the array > douse not seem to be set. > > if ( $action == "Save" ) { > > $count = count( $product_code ); > > for( $index=1; $index <= $count; ++$index ) { Just a thought here. If you're not actually assigning the key of 1 - whatever to the array, but letting the array fill as it will, the first element will be 0 and the last will be count($array) - 1. In that case, your for loop should be: for($index = 0; $index < $count; $index++) > > if ( isset( $seq[$index]) ) { > $seq = "'".$seq[$index]."'"; > } else { > $seq = "NULL"; > } > > echo( > "update products ". > "set seq=$seq ". > "where code='".$product_code[$index]."'" ); > } > > $action = "list"; > > } > > I get the followig error:- > > Notice: Uninitialized string offset: 3 in This offset of 3 might confirm my assumption. Are there 3 elements in the array right now? > d:\wwwroot\cultureshop\list_products.php on line 412 > > > At 17:19 08/04/2003 -0600, Rob Adams wrote: > > > >"Ben Edwards" <ben@videonetwork.org> wrote in message > > >>news:5.1.1.6.2.20030408235826.0344e170@mail.videonetwork.org... > > > I am trying to see if elements of a number indexed array are set, i.e. > > > something like:- > > > > > > if ( isset( $seq[$index]) ) { > > > echo $seq[$index]."<br>"; > > > } > > > >The only error I get when running this is when $index is undefined. I can > >call > >isset($seq[whatever number you please here]) > > without getting an error. > > > > > > > > Except in this case isset gives an error. How do i 'ask' if the element > > > has been initialized? > > > > > > Ben > > > > > > > > > **************************************************************** > > > * Ben Edwards Tel +44 (0)117 968 2602 ICQ 42000477 * > > > * Critical Site Builder > > > http://www.criticaldistribution.com * > > > * online collaborative web authoring content management system * > > > * Get alt news/views films online > > > http://www.cultureshop.org * > > > * i-Contact Progressive Video > > > http://www.videonetwork.org * > > > * Fun corporate graphics > > > http://www.subvertise.org * > > > * Bristol Indymedia > > > http://bristol.indymedia.org * > > > * Bristol's radical news > > > http://www.bristle.org.uk * > > > **************************************************************** > > > > > > > > >--------------------------------------------------------------------------- - > >---- > > > > > > > > > > --- > > > Outgoing mail is certified Virus Free. > > > Checked by AVG anti-virus system (http://www.grisoft.com). > > > Version: 6.0.465 / Virus Database: 263 - Release Date: 25/03/2003 > > > > > > > > > > >-- > >PHP General Mailing List (http://www.php.net/) > >To unsubscribe, visit: http://www.php.net/unsub.php > > > > > > > >--- > >Incoming mail is certified Virus Free. > >Checked by AVG anti-virus system (http://www.grisoft.com). > >Version: 6.0.465 / Virus Database: 263 - Release Date: 25/03/2003 > > **************************************************************** > * Ben Edwards Tel +44 (0)117 968 2602 ICQ 42000477 * > * Critical Site Builder http://www.criticaldistribution.com > * > * online collaborative web authoring content management system * > * Get alt news/views films online http://www.cultureshop.org > * > * i-Contact Progressive Video http://www.videonetwork.org > * > * Fun corporate graphics http://www.subvertise.org > * > * Bristol Indymedia http://bristol.indymedia.org > * > * Bristol's radical news > http://www.bristle.org.uk * > **************************************************************** > ---------------------------------------------------------------------------- ---- > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.465 / Virus Database: 263 - Release Date: 25/03/2003 > -- Rob