Re: [PHP] Need routine to tell me number of dimensions in array.

Peter Lind wrote:
> This is one example where references actually decrease memory usage.
> The main reason is the recursive nature of the function. Try
> 
> <?php
> 
> echo memory_get_usage() . PHP_EOL;
> $array = range(0,1000000);
> $array[10] = range(0,10);
> $array[20] = range(0,10);
> $array[30] = range(0,10);
> $array[40] = range(0,10);
> $array[50] = range(0,10);
> $array[60] = range(0,10);
> $array[70] = range(0,10);
> $array[80] = range(0,10);
> $array[90] = range(0,10);
> $array[100] = range(0,10);
> echo memory_get_usage() . PHP_EOL;
> carray($array);
> function carray ($array)
> {
>     foreach ($array as $value)
>     {
>         if (is_array($value)) carray($value);
>     }
>     echo memory_get_usage() . PHP_EOL;
>     echo count($array) . PHP_EOL;
> }
> echo memory_get_usage() . PHP_EOL;
> 
> And then compare with:
> 
> <?php
> 
> echo memory_get_usage() . PHP_EOL;
> $array = range(0,1000000);
> $array[10] = range(0,10);
> $array[20] = range(0,10);
> $array[30] = range(0,10);
> $array[40] = range(0,10);
> $array[50] = range(0,10);
> $array[60] = range(0,10);
> $array[70] = range(0,10);
> $array[80] = range(0,10);
> $array[90] = range(0,10);
> $array[100] = range(0,10);
> echo memory_get_usage() . PHP_EOL;
> carray($array);
> function carray (&$array)
> {
>     $i = 0;
>     foreach ($array as $value)
>     {
>         if (is_array($value)) carray($value);
>     }
>     echo memory_get_usage() . PHP_EOL;
>     echo count($array) . PHP_EOL;
> }
> echo memory_get_usage() . PHP_EOL;
> 
> The memory usage spikes in the first example when you hit the second
> array level - you don't see the same spike in the second example.
> 
> Regards
> Peter

Doh, forgot about that :)

Cheers,
Rob.
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