[nycphp-talk] Getting the number of dimensions of an array
Joey Derrico
joeyd473 at gmail.com
Fri May 18 18:58:30 EDT 2012
I have test some of these out, but count(recursive) doesn't give the depth
of an array
Joey
On Fri, May 18, 2012 at 5:11 PM, Anthony Ferrara <ircmaxell at gmail.com>wrote:
> Except that doesn't do what you think it does...
>
> $a = [[[1,2]]];
>
> The depth here is clearly 3.
>
> But count($a, COUNT_RECURSIVE); gives 4: http://codepad.viper-7.com/7xPYCu
>
> It counts the total number of elements in the array, and any child
> arrays (including the child array)...
>
> Also: constants exist for a reason. I'd suggest not doing count($a,
> 1), but using the reserved constant: count($a, COUNT_RECURSIVE). Not
> only does it make it future proof (for example, what if the value of 1
> changed in the future), it also makes it easier to read the function
> call...
>
> Anthony
>
> On Fri, May 18, 2012 at 5:03 PM, Donald Organ <dorgan at donaldorgan.com>
> wrote:
> > http://us.php.net/count
> >
> > $size = count($array, 1);
> >
> >
> > On Fri, May 18, 2012 at 4:54 PM, Anthony Ferrara <ircmaxell at gmail.com>
> > wrote:
> >>
> >> Another trick would be to not use function recursion, but a recursive
> >> iterator:
> >>
> >> http://codepad.viper-7.com/9PeM9c
> >>
> >> function maxDepth(array $a) {
> >> $it2 = new RecursiveIteratorIterator(
> >> new RecursiveArrayIterator($a)
> >> );
> >> $max = 0;
> >> foreach ($it2 as $val) {
> >> $max = max($max, $it2->getDepth());
> >> }
> >> return $max;
> >> }
> >>
> >> It will actually process less data, since the
> >> RecursiveIteratorIterator mode is to skip non-leaf nodes (in other
> >> words, elements that are arrays). So the max() call will only ever be
> >> called for non-array values... A micro-optimization for sure, but
> >> something worth noting...
> >>
> >> Anthony
> >>
> >>
> >> On Fri, May 18, 2012 at 4:48 PM, justin <justin at justinhileman.info>
> wrote:
> >> > function array_depth($el) {
> >> > return is_array($el) ? max(array_map('array_depth', $el)) + 1 : 0;
> >> > }
> >> >
> >> > var_dump(array_depth($array));
> >> >
> >> >
> >> > -- justin
> >> >
> >> >
> >> >
> >> > On Fri, May 18, 2012 at 1:27 PM, Joey Derrico <joeyd473 at gmail.com>
> >> > wrote:
> >> >> I am trying to count the number of dimensions in an array. I used my
> >> >> google-fu and came up with answers that don't actually work because I
> >> >> can
> >> >> have multi-dimensional array's where one int he middle is multi and
> the
> >> >> one
> >> >> after not. Below is my latest set of test code (I have been playing
> >> >> with it
> >> >> for hours (with varying results), none correct), It currently returns
> >> >> 15
> >> >> dimensions and should be returning 5
> >> >>
> >> >> <?php
> >> >> echo "\n";
> >> >> $test = new test();
> >> >>
> >> >> $array = array();
> >> >> $array[0] = '[0]';
> >> >> $array[1][0] = '[1][0]';
> >> >> $array[1][1] = '[1][1]';
> >> >> $array[2][0][0] = '[2][0][0]';
> >> >> $array[2][0][1] = '[2][0][1]';
> >> >> $array[2][1][0] = '[2][1][0]';
> >> >> $array[2][1][1] = '[2][1][1]';
> >> >> $array[3][0][0][0] = '[3][0][0][0]';
> >> >> $array[3][0][0][1] = '[3][0][0][1]';
> >> >> $array[3][1][0][0] = '[3][1][0][0]';
> >> >> $array[3][1][0][1] = '[3][1][0][1]';
> >> >> $array[3][1][1][0] = '[3][1][1][0]';
> >> >> $array[3][1][1][1] = '[3][1][1][1]';
> >> >> $array[4][0][0][0][0] = '[4][0][0][0][0]';
> >> >> $array[4][0][0][0][1] = '[4][0][0][0][1]';
> >> >> $array[4][1][0][0][0] = '[4][1][0][0][0]';
> >> >> $array[4][1][0][0][1] = '[4][1][0][0][1]';
> >> >> $array[4][1][1][0][0] = '[4][1][1][0][0]';
> >> >> $array[4][1][1][0][1] = '[4][1][1][0][1]';
> >> >> $array[4][1][1][1][0] = '[4][1][1][1][0]';
> >> >> $array[4][1][1][1][1] = '[4][0][0][0][1]';
> >> >> $array[5][0][0][0] = '[5][0][0][0]';
> >> >> $array[5][0][0][1] = '[5][0][0][1]';
> >> >> $array[5][1][0][0] = '[5][1][0][0]';
> >> >> $array[5][1][0][1] = '[5][1][0][1]';
> >> >> $array[5][1][1][0] = '[5][1][1][0]';
> >> >> $array[5][1][1][1] = '[5][1][1][1]';
> >> >> $array[6][0][0] = '[6][0][0]';
> >> >> $array[6][0][1] = '[6][0][1]';
> >> >> $array[6][1][0] = '[6][1][0]';
> >> >> $array[6][1][1] = '[6][1][1]';
> >> >> $array[7][0] = '[7][0]';
> >> >> $array[7][1] = '[7][1]';
> >> >> $array[8] = '[8]';
> >> >>
> >> >> echo 'The array has
> '.$test->countNumberOfDimensionsOfAnArray($array)."
> >> >> dimensions\n";
> >> >> //echo print_r($array,TRUE);
> >> >>
> >> >>
> >> >> class test
> >> >> {
> >> >> public function isMultDimensionalArray($array)
> >> >> {
> >> >> $return = FALSE;
> >> >>
> >> >> if(is_array($array)){
> >> >> foreach($array as $value){
> >> >> if(is_array($value)){
> >> >> $return = TRUE;
> >> >> }
> >> >> }
> >> >> }
> >> >> return $return;
> >> >> }
> >> >>
> >> >> public function countNumberOfDimensionsOfAnArray($array)
> >> >> {
> >> >> $dimensions = 0;
> >> >>
> >> >> if(is_array($array)){
> >> >> $dimensions++;
> >> >> foreach($array as $key=>$value){
> >> >> if($this->isMultDimensionalArray($value)){
> >> >> $dimensions = $dimensions +
> >> >> $this->countNumberOfDimensionsOfAnArray($value);
> >> >> }
> >> >> }
> >> >> }
> >> >> return $dimensions;
> >> >> }
> >> >> }
> >> >> ?>
> >> >>
> >> >> Joey Derrico
> >> >>
> >> >> _______________________________________________
> >> >> New York PHP User Group Community Talk Mailing List
> >> >> http://lists.nyphp.org/mailman/listinfo/talk
> >> >>
> >> >> http://www.nyphp.org/show-participation
> >> >
> >> >
> >> >
> >> > --
> >> > http://justinhileman.com
> >> > _______________________________________________
> >> > New York PHP User Group Community Talk Mailing List
> >> > http://lists.nyphp.org/mailman/listinfo/talk
> >> >
> >> > http://www.nyphp.org/show-participation
> >> _______________________________________________
> >> New York PHP User Group Community Talk Mailing List
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> >
> >
> >
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