Taking an array from a multidimensional array and passing the values to variables in PHP

Question

This code is supposed to created a multidimensional array, shuffle it, select the first array, and pass the four values to four different variables called $common, $uncommon, $rare, and $superrare.

<?php

//create multidimentional array
$distribution = array
(
array(115, 50, 15, 0),
array(115, 49, 16, 0),
array(115, 48, 17, 0),
array(116, 49, 15, 0),
array(116, 48, 16, 0),
array(116, 47, 17, 0),
array(117, 48, 15, 0),
array(117, 47, 16, 0),
array(117, 46, 17, 0),
array(118, 47, 15, 0),
array(118, 46, 16, 0),
array(118, 45, 17, 0),
array(119, 46, 15, 0),
array(119, 45, 16, 0),
array(119, 44, 17, 0),
array(120, 45, 15, 0),
array(120, 44, 16, 0),
array(120, 43, 17, 0),
);

//shuffle the md-array
shuffle($distribution);

//select first array from $distribution
$slice[] = array_slice($distribution ,0, 1);

//create an array for key values
$cardrarity = array('common', 'uncommon', 'rare', 'superrare');

//combine $cardrarity and $slice
$cardraritycount = array_combine($cardrarity, $slice);

//create a variable for each value in 
foreach ($cardraritycount as $key => $value){
    $$key = $value;
    }
?>

When I view the contents of $slice it looks like this:

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [0] => 120
                    [1] => 43
                    [2] => 17
                    [3] => 0
                )

        )

)

When I try and combine $slice with $cardrarity, I get no output when I try and echo the contents. I think my problem is when I'm doing the array slice. Any help would be appreciated.

@AbraCadaver, wow thanks! just found the doc and I had no idea of such a thing — Jeff Puckett
– Jeff Puckett, Commented Apr 29, 2016 at 18:47

Rajdeep Paul · Accepted Answer · 2016-04-29 18:34:05Z

5

There's no need to complicate such simple things. Simply do this:

// Shuffle the array
shuffle($distribution);

// Assign values to the respective variables
list($common, $uncommon, $rare, $superrare) = $distribution[0];

// Display values
echo $common . "<br />";
echo $uncommon . "<br />";
echo $rare . "<br />";
echo $superrare . "<br />";

Here's the reference:

list()

answered Apr 29, 2016 at 18:34

Rajdeep Paul

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1 Comment

DigitalFirefly Over a year ago

That did it. Thank you so much. I'm just teaching myself PHP, wasn't aware of list. Struggled with this one all day.

Barmar · Accepted Answer · 2016-04-29 18:35:19Z

4

array_slice($distribution, 0, 1) returns a multi-dimensional array. It's a 1-element array whose first element is the first element of $distribution. If you just want the first element of $distribution, use $distribution[0].

To assign to multiple variables from an array, use an assignment to the list() function.

So the whole thing should be:

list($common, $uncommon, $rare, $superrare) = $distribution[0];

answered Apr 29, 2016 at 18:35

Barmar

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2 Comments

DigitalFirefly Over a year ago

Thank you, that worked. Rajdeep must have been a split second faster in answering.

Barmar Over a year ago

But he didn't explain what was wrong with your code like I did.

AbraCadaver · Accepted Answer · 2016-04-29 18:53:22Z

1

Not only is array_slice() returning a multi-dimensional array but you are creating even another dimension with $slice[].

Using $distribution[0] you have two options other than list():

shuffle($distribution);
$cardrarity = array('common', 'uncommon', 'rare', 'superrare');
$cardraritycount = array_combine($cardrarity, $distribution[0]);

Then your foreach() works correctly:

foreach ($cardraritycount as $key => $value){
    $$key = $value;
}

Or extract() the array as variables:

extract($cardraritycount);

answered Apr 29, 2016 at 18:53

AbraCadaver

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