如何按此顺序打印数组？

Question

Hello guys please help I have array contains three arrays , each array contains a different amount of chars how ever the first array always have the greater amount of chars then the second and so on . Notice that two Consecutive arrays may have the same amount of chars check this example

array     //called lines
(
 ['a','b','c','d'],
 ['e','f','g'],
 ['h','i']
);

Am trying to iterate the main array and each time print the first letter of each array and then shift it out of the array so first time I will print 'a' from the first array shift it from the array and then move to second array and print 'e' and shift it from the array , move to the third and print 'h' the shift it then go back and do the same till all of them are empty so how can I do that here is what the output should look like "aehbficgd" sorry if the question is too long thanks

        while(!empty($lines))
        {
            $counter = 0;

            echo $lines[$counter][0];
            array_shift($lines[$counter]);
            $counter++;

            if($counter == count($lines))
            {
                $counter = 0;
            }
        }

Answer 1

What about this?

$lines = array
(
   ['a','b','c','d'],
   ['e','f','g'],
   ['h','i']
);

$continue = true;
while($continue)
{
    $continue = false;
    foreach($lines as $key => $line) {
        if(!empty($line)) {
            echo array_shift($line);

            $lines[$key] = $line;
            $continue = true;
        }
    }
}

You can try it here https://3v4l.org/TrcmA