Help with Arrays

[Anon]

I have two arrays, A and B. I want to compare both arrays (filter from A anything which exists in 😎.

I can do it using loops. Is there a faster way.

The Arrays are two dimensional.

Thanks in advance.

BB

[[deleted]]

what exactly do you want to do?

[Anon]

As my first posting reads.

I have two arrays. Array A contains all product names. Array B contains selected product names for the customer. I want to create an array containing the product names which have not been selected.

I can do it with loops but I am not sure that this is the best method.

Can anyone suggest a different way.

Many Thanks

BB :-)

[[deleted]]

But you said your arrays were two-dimentional, what do they look like?

[Anon]

Array A would be

A [0] [0] = 121
A [0] [1] = Apple

A [1] [0] = 875
A [1] [1] = Orange

A [2] [0] = 543
A [2] [1] = Pear

[jscnet]

YOU WROTE
I have two arrays. Array A contains all product names. Array B contains selected product names for the customer. I want to create an array containing the product names which have not been selected.

I can do it with loops but I am not sure that this is the best method.

Can anyone suggest a different way.

REPLY FOLLOWS

Yes -- I think you can accomplish this very easily -- although you may want to move to an Associative Array.

For example:

[A Array]

$inventory = array("121"=>"Apple","875"=>"Orange","543"=>"Pear");

<select name="selections[]" size="3" multiple>

[SOLUTION]

<?
foreach($inventory as $key=>$value)
{

if(!(in_array($key, $selections)))
{
$notSelected[$key] = $value;
}

}
?>

Jason

[[deleted]]

And array B would be....?

[jscnet]

Array B is dynamically created from your multiple selections.

<select name="selections[]" size="3" multiple>

When you press your submit button, "selections[]" will be passed as an array of your selections, hence why the following code works:

<?
foreach($inventory as $key=>$value)
{

if(!(in_array($key, $selections)))
{
$notSelected[$key] = $value;
}

}
?>

Notice the "in_array" and "$selections"?

What that line is saying is: IF $KEY ISN'T IN THE $SELECTIONS ARRAY, THEN GO AHEAD AND ADD THE $KEY AND $VALUE (OF THE $INVENTORY ARRAY) TO THE NEW ARRAY, CALLED $NOTSELECTED.

I hope this makes it a bit more clear... if not, let me know. :-)

Jason

PS. You can also check to see if they have made ANY selections at all simply by using the following commands:

if(!(is_array($selections)))
{
print("Ops.. you've made no selections.\n");
}

You see, $selections will not become an array unless something is selected.