Mine

for($h=1;$h<100;$h++){        if(!array_key_exists($h, $categories))        {  				break;        }				if (!array_key_exists(1, $categories[$h]))		    {				break;        }               for($i=1;$i<100;$i++)        {                 if(!array_key_exists($i, $categories[$h]))                {  						break;                }								//print(sizeof($strings));							                // This will turn the array into a string with all subcategories, separated by ;.                // For example, 0;3;53 if subcategory 0, 3 and 53 are checked                $strings[$h][$i] = implode(';', $categories[$h][$i]);			         }		}