in PHP find if a value of an inner array exists, then if found, delete the array

Question

I have fairly simple 2 dimensional array. i'm trying to write a function that finds if a value exists in one of the inner arrays. that is not so hard. problem is that i need to then delete the entire inner array once found. that's what i'm having trouble with. seems impossible to do using foreach loops.

anyway, here is the array. thanks!

$booksInCart = Array (Array ('bookId' => 344, 'quantity' => 1), 
             Array ('bookId' => 54, 'quantity' => 1), 
             Array ('bookId' => 172, 'quantity' => 2), 
              Array ('bookId' => 3, 'quantity' => 1)
);

Sverri M. Olsen · Accepted Answer · 2013-09-04 02:50:02Z

1

Use the foreach loop with key and value. Use the key to unset() a sub-array...

foreach ($booksInCart as $key => $sub) {
    if ($sub['bookId'] == 172) {
        unset($booksInCart[$key]);
    }
}

answered Sep 4, 2013 at 2:50

Sverri M. Olsen

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Comments

Lawrence Cherone · Accepted Answer · 2013-09-04 03:06:30Z

Try something like:

<?php
//Your cart array
$booksInCart = Array (
    Array ('bookId' => 344, 'quantity' => 1),
    Array ('bookId' => 54, 'quantity' => 1),
    Array ('bookId' => 172, 'quantity' => 2),
    Array ('bookId' => 3, 'quantity' => 1)
);

//User function to rebuild the array leaving out the bookID you want removed
function delete_book_from_cart($bookID, $haystack){
    $ret = array();
    foreach($haystack as $key=>$item){
        if($item['bookId'] == $bookID) continue;
        $ret[$key]=$item;
    }
    return $ret;
}

//Use like so
$booksInCart = delete_book_from_cart(172, $booksInCart);

/* Result
Array
(
    [0] => Array
        (
            [bookId] => 344
            [quantity] => 1
        )

    [1] => Array
        (
            [bookId] => 54
            [quantity] => 1
        )

    [3] => Array
        (
            [bookId] => 3
            [quantity] => 1
        )

)

*/
print_r($booksInCart);
?>

The same method can be used to update quantity's of a book:

//User function to rebuild the array updating the qty you want changed
function update_book_in_cart($bookID, $qty, $haystack){
    $ret = array();
    foreach($haystack as $key=>$item){
        if($item['bookId'] == $bookID) $item['quantity'] = $qty;
        $ret[$key]=$item;
    }
    return $ret;
}

and so on

xdazz · Accepted Answer · 2013-09-04 02:48:11Z

0

// assume you want to delete bookId with 54.
$bookId = 54;
$booksInCart = array_filter($booksInCart, function ($var) use ($bookId) {
  return $var['bookId'] !== $bookId;
});

answered Sep 4, 2013 at 2:48

xdazz

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Comments

DiMono · Accepted Answer · 2013-09-04 02:48:22Z

0

What you can do is store the index of the inner array in the loop as well, and then if the value is found delete it from the outer array using that index. Something like:

foreach ($booksInCart as $id => $inner) {
    // Second foreach loop because you didn't specify which value you're checking
    // and I want to insure complete thoroughness
    foreach ($inner as $key => $value) {
        if ($key == $requiredkey && $value == $requiredvalue) {
            unset($booksInCart($id));
        }
    }
}

answered Sep 4, 2013 at 2:48

DiMono

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2 Comments

Sverri M. Olsen Over a year ago

unset is a function, not a language keyword.

DiMono Over a year ago

Thanks, I'd forgotten the brackets; I've added them in.

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