RE: [PHP] Is there such an array like $array[][]?

I don't understand your different definitions: "muti-dimensional" and "array of arrays" From the manual: Multi-Dimensional Arrays Multi-dimensional arrays are actually pretty simple. For each dimension of the array, you add another [key] value to the end: > Tim Ward wrote: > <snip> > What looks like a 2d array is fact an array of arrays (and so > on). If it's built right this can be treated as a multi-d array in many > ways ... but not all. I wonder if you can help me understand this concept by giving an example of what is possible with 1-dim arrays, but not with 3-dim arrays? From my point of view the only difference is writing a custom comparison function when sorting, though this does seem logical considering the additional complexity of multiple dimensions. Thanks for your help. Robert Zwink -----Original Message----- From: Tim Ward [mailto:tim.ward@stivesdirect.com] Sent: Tuesday, April 24, 2001 9:54 AM To: 'Robert V. Zwink' Subject: RE: [PHP] Is there such an array like $array[][]? my point was that what appear to be multi-dimensional arrays in php are not that at all. What looks like a 2d array is fact an array of arrays (and so on). If it's built right this can be treated as a multi-d array in many ways ... but not all. There seem to be a lot of queries from people confused about how to deal with arrays of arrays and this often stems from a misconception that they are actually multi-d arrays. Tim Ward Senior Systems Engineer Please refer to the following disclaimer in respect of this message: http://www.stivesdirect.com/e-mail-disclaimer.html > -----Original Message----- > From: Robert V. Zwink [mailto:rzwink@microcenter.com] > Sent: 24 April 2001 14:33 > To: Tim Ward; php-general@lists.php.net > Subject: RE: [PHP] Is there such an array like $array[][]? > > > I have used the function usort() to sort multi-dimensional > arrays before. > It might be a challenge to write the comparison function, but it is > possible. I use 3-dim arrays all of the time. Makes for a > bit cleaner code > IMHO. > > I suppose one thing to consider, is that if you have an enormous 3-dim > array, you are probably doing something wrong. Generating a > really big > array can be resource intense, and can slow you page down > exponentially. > Select only parts of the recordset, or smaller chuck of the > file for better > execution, but if your application requires a large 3-dim > array, it works > just fine for me. > > Robert Zwink > > -----Original Message----- > From: Tim Ward [mailto:tim.ward@stivesdirect.com] > Sent: Wednesday, April 18, 2001 8:06 AM > To: 'php-general@lists.php.net' > Subject: RE: [PHP] Is there such an array like $array[][]? > > > 1. there are no multi-dimensional arrays in php, just single dimension > arrays each element of which may be an array (or any other > variable type). > If you make every element of an array an array of size x, you > will get what > can be used as a multi-dimensional array. But if you forget > what it really > is, you'll run into problems like expecting to be able to sort > $array[$x][$y] by $y. > 2. because of this you can have as many levels of an array as > you want. > > try : > $array[][][][] = "fred"; > foreach($array as $level1) > foreach($level1 as $level2) > foreach($level2 as $level3) > foreach($level3 as $value) > echo($value); > > Tim Ward > Senior Systems Engineer > > Please refer to the following disclaimer in respect of this message: > http://www.stivesdirect.com/e-mail-disclaimer.html > > > > -----Original Message----- > > From: Plutarck [mailto:aemuli@spamclause-yahoo.com] > > Sent: 17 April 2001 17:42 > > To: php-general@lists.php.net > > Subject: Re: [PHP] Is there such an array like $array[][]? > > > > > > PHP can be a tad screwy with how it handles multi-dimensional > > arrays, but > > yes PHP handles them. No real speed problems with them either. > > > > But you may just want to use an associative array like: > > > > $loc = array("y" => $y, "x" => $x); > > > > Then just use $loc["y"] and $loc["x"]. > > > > Just another option, but feel free to use multi-dimensional > > arrays. Just be > > aware that PHP supports only two dimensions (so $array[][][] > > will not work), > > and if you try and get fancy with sort() and count() you are > > going to give > > yourself a migraine. > > > > > > -- > > Plutarck > > Should be working on something... > > ...but forgot what it was. > > > > > > "Jack Dempsey" <dempsejn@georgetown.edu> wrote in message > > news:3ADC731D.654BEE7@georgetown.edu... > > > yes, that's a multi-dimensional array, which is fine in php (and > > > everything else i can think of =P)... > > > > > > -jack > > > > > > Scott Fletcher wrote: > > > > > > > > Hi! I am wondering if there is such a php array that can > > take care of > > the x > > > > and y axis data. I figure that using this array type, > > $axis[$x][$y] > > would > > > > do the trick. Would it work? If not, then education me > > on what would > > work! > > > > Thanks! > > > > > > > > Scott > > > > > > > > -- > > > > PHP General Mailing List (http://www.php.net/) > > > > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > > > > For additional commands, e-mail: php-general-help@lists.php.net > > > > To contact the list administrators, e-mail: > > php-list-admin@lists.php.net > > > > > > -- > > > PHP General Mailing List (http://www.php.net/) > > > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > > > For additional commands, e-mail: php-general-help@lists.php.net > > > To contact the list administrators, e-mail: > > php-list-admin@lists.php.net > > > > > > > > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: > php-list-admin@lists.php.net >