array help

csharpcoder

Hello, i'm totally new to php and I'm trying to figure something out using php.

I have 2 arrays and I need to grab the values of the arrays if the keys match in the arrays.

Here is what i'm trying to do.

$array1 = ("Jeff", "kevin", Jeff", "Sally");
$array2 = ("20", "34", "19", "340");

I need to add the values of the matching keys,
so I would want to see

Jeff 39
Kevin 34
Sally 340

how can I accomplish this?

thanks

Res

Something like this would work

$array1 = array("Jeff", "kevin", "Jeff", "Sally");
$array2 = array("20", "34", "19", "340");

foreach($array1 as $key => $name){
   echo $name." - ".$array2[$key]."<br/.";
}

csharpcoder

thanks i'll give it a shot,

is there a way to only show Jeff and his total, since he appears twice?

bradgrafelman

One way would be to use the values from $array1 as keys in a new array, and use a [man]foreach/man loop to loop through $array2 and do the following: if the key already exists in the new array, update its value with (old_value + value from array2); if it doesn't already exist, add it to the new array and give it a value of the value from array2.

Try giving that a shot and show us what you come up with if you get stuck.

EDIT: Also, welcome to PHPBuilder!

csharpcoder

the foreach loops is what's getting me, how do I loop through it all and only show the one? I can loop through but it's pulling me back all of them.

i only want the one that shows more then once

bradgrafelman

Here's what I was talking about:

$newArray = array();

for($i = 0; $i < count($array1); $i++)
  if(!isset($newArray[$array1[$i]]))
    $newArray[$array1[$i]] = $array2[$i];
  else
    $newArray[$array1[$i]] += $array2[$i];

csharpcoder

I have to be honest, this is my first php task i've ever gotten and so far its all "greek" to me right now. I'm actually learning as I go here.

What does the code you just provide output?

csharpcoder

Ok, i'm so close, but I need only to show the one that is in the array more then once. though this code is close

bradgrafelman

csharpcoder wrote:
I need only to show the one that is in the array more then once.

Ah well you never mentioned that.

What happens if there is a tie (e.g. more than one value appears N times)?

csharpcoder

thats fine, and we may have cases like that.

i'll need the total of them if it appears more then once

bradgrafelman

Well you can use my code above to build a new array of totals (use [man]print_r/man on $newArray if you don't believe me), and you can use [man]array_count_values/man on the original $array1 to figure out which keys appear >1 times.

If I'm understanding you correctly, then you could use the [man]foreach/man loop that utilizes the '$key => $value' syntax on the output of array_count_values() and check if the value is >1 (e.g. that item appeared more than once in $array1) and, if so, output the total from the $newArray (using the '$key' variable from the foreach loop as the key for $newArray).