Comparing Arrays

[SharkBait]

How would I go about comparing two arrays to see a) if they match b) if one array has values the other doesnt etc?

 

Example:

$arr1 = array("tyler", "bob", "jen");
$arr2 = array("tyler", "jen", "alice", "tom");

 

If the arrays match, then I want to exit and do nothing.

 

If $arr1 has items in it that $arr2 doesn't then I am looking to print out the differences only.

 

So the older stored array is $arr1 (think of it being stored in a database).

 

When I get $arr2 I want to see how much different array 1 is from array 2. if there is a differnce then show what has changed and then update the row in the table.

 

So tyler, bob and jen are in the table. But now alice and tom have joined but bob has left.

 

Is this easily done?

[kenrbnsn]

Read all about arrays and the array functions in the fine manual.

 

Ken

[SharkBait]

I figured out how i can do it using in_array()

[Orio]

<?php

$arr1 = array(...);
$arr2 = array(...);
$diff = array_diff($arr1, $arr2);
if(empty($diff))
  exit;
foreach($diff as $val)
  echo $val."<br>";

?>

 

Orio.