当路径（级别）到值是动态变化时，如何访问多维PHP数组？

Question

To set a value in a multidimentional array is easy. E.g.:

$myArray['levelA']['levelB']['levelC'] = $value

to read it is simple, too. E.g.:

$value = $myArray['levelA']['levelB']['levelC']-

Easy when i know how many levels are used. But what is when we do not know how many levels could occure?

What if i have a config file like this:

levelA.levelB.levelC.levelD = someValue

and what if i want to use levelA.levelB.levelC.levelD to map it (as a "path") to the multidimentional array, whichout knowing how deep my config could be?

Answer 1

Here's a small class I wrote that would determine the number of dimensions. You could easily modify it to do whatever you wanted, or just use the number it returns to guide your own function:

class DimensionCounter {

    var $i;

    public function count($array) {
        $this->i = 1;
        return $this->readArray($array);
    }

    private function readArray($array) {

        foreach($array as $value) {
            if (is_array($value)) {
                $this->i++;
                $this->readArray($value);               
            }
            return $this->i;
        }
    }
}

In your case, $counter = new DimensionCounter(); $num = $counter->count($value); would give you the number of dimensions.