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

A multi dimensional array is a matrix. if $array[1][2][3] was an element of a multi-dimensional array then it would directly accessible as an element of $array. It isn't. $array (and $array[n]) only contain arrays. If $array was a 3-d array then ... $array[1][2][3] = "fred"; if (in_array("fred", $array)) echo "fred found"; // prints "fred found" 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 15:20 > To: Tim Ward > Cc: Php-General@Lists.Php.Net > Subject: 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 > > >