NYCPHP Meetup

[Anthony Ferrara]

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
>> >>
>> >> _______________________________________________
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>> >>
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>> >
>> >
>> >
>> > --
>> > http://justinhileman.com
>> > _______________________________________________
>> > New York PHP User Group Community Talk Mailing List
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