Difference between a for loop and for while nested with list()

Question

Can someone tell me what the difference between these two loops / code snippets are?

I am getting the same output, but a text book is indicating there is a difference with the outer and inner loop? Any clarification would be helpful. I don't think I am understanding the list with each function.

Array definition:

$newArray  = array(array('CODE' => 'TIR', 'Description' =>'TIRES', 'Price' => 100),
                   array('CODE' => 'OIL', 'Description' => 'Oil', 'Price' =>10),
                   array('CODE' => 'SPK', 'Description' => 'Spark Plug', 'Price' =>40)
             );

Code snippet 1:

for ($row = 0; $row < 3; $row ++)
{           
    echo ' |'.$newArray[$row]['CODE'].'| '.$newArray[$row]['Description']. '| '.$newArray[$row]['Price'];
    echo  '<br />';
    echo  '<br />';      
}

Code snippet 2:

for ($row =0; $row <3; $row ++)
{
    while (list($key, $value) = each ($newArray[$row]))
    {
        echo "|$value";
    }
    echo  '<br />';
    echo  '<br />';
}

Well, once you hardcode the second dimension keys and in the second one you use a while loop to loop through all elements of each subArray. Just add another value to each subArray and you will see it, something like: "another element" => "Will only be shown by the second code snippet" — Rizier123
– Rizier123, Commented Apr 12, 2016 at 7:21

shikhar · Accepted Answer · 2016-04-12 07:54:16Z

1

Yes, there's a difference if you look at it from algorithm point of view.

The first one has the time complexity of O(n) and the second one O(n²).

So, the first one is more efficient.

answered Apr 12, 2016 at 7:54

shikhar

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2 Comments

Rizier123 Over a year ago

The two code snippets do net the same ting, so you can't really compare them.

shikhar Over a year ago

Well you are assuming that the second dimension is hardcoded, I am assuming both array length and dimension to be variable.

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